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| September 30 | ||
|---|---|---|
 Team Symfuhny  Team Swagg in the RØKKR Royale 2. | ||
| September 28 | ||
| Team Tommey Team WarsZ in the AORUS NVIDIA GeForce Brawl. | ||
 DVO | Dolphin is loaned from Tyrant Gaming. | |
 ASTR | Dolphin is loaned to Daivo.FreeSlot. | |
| September 27 | ||
 ER | Mind leaves. | |
 Team Mayhem,  REJECT, and  Influence Rage qualify for the COD Mobile World Championship 2020. | ||
Influence Rage  FEB E-Sports in the COD Mobile World Championship 2020 LA Final. | ||
REJECT  寝室チーム(笑) in the COD Mobile World Championship 2020 JP Final. | ||
Team Mayhem  3rBSquad in the COD Mobile World Championship 2020 EA Final. | ||
 ETR | Genue, Stirpeeh, Vidal, Xpiry, and xRoToo leave. | |
 TaL | envdiaN, PuNi, Sukry, SupeR, and YaKo leave. | |
| September 26 | ||
 Pushing Gaming  Clutch Rayn Esport in the NGL Open Cup 2020
. | ||
| TommeyBrittney Jukeyzafk in the CheckMate Gaming $1,000 2v2 SiLLY Invitational. | ||
 ACE1 | Rydekz joins. BooM and Draken leave. | |
| September 24 | ||
| Vikkstar123 & Rated MerK & Maven in the Vikkstar's Warzone Showdown: Week 5
. | ||
 sKAE | Goldz, Sheed, Soldier, Suricato, and DreeyK (Coach) join. | |
 VrT | Sheed and Soldier leave. | |
| September 23 | ||
 NOVA | Team signs roster of  Dice Esports. AY, Deci, Kraken, Luis, Saxy, Shadow, and Vitaly join. | |
 DC | Roster is signed by  Nova Esports. AY, Deci, Kraken, Luis, Saxy, Shadow, and Vitaly leave. | |
 SEA | Gunless, Loony, and Prestinni join. | |
| September 21 | ||
| Team 6 Team 11 in the CheckMate Gaming TST Invitational. | ||
 RSG | Derp, Edz, Raven, Wenn, and Izzul (Coach) join. RanGer (Content Manager to Player) changes position. | |
 21 | Derp, Edz, RanGer, Raven, Wenn, and Izzul (Coach) leave. | |
 DVT | IrfanJ joins. | |
| September 18 | ||
| Black Ops Cold War Open Alpha begins on PlayStation 4. | ||
 NY | Clayster joins. Mack and ZooMaa will remain with the team. | |
 DAL | Clayster leaves. | |
| September 17 | ||
 BTG | Boards, CHaTTr, Cruelty, and Stolly join. | |
 UYU | Davpadie leaves. | |
| Team 7 Team 8 in the Twitch Rivals FaZe Face-Off
. | ||
 NRX | KenDy joins. | |
 TYR | KenDy leaves. | |
| September 16 | ||
 F/A | Cruze moves from Asia Pacific to North America. | |
| UYU | Cells, Charullz, and Jintroid leave. | |
| HusKerrs & AverageJoewo Sackzi & Berdydraft in the Vikkstar's Warzone Showdown: Week 4
. | ||
| Black Ops Cold War Open Alpha coming to PlayStation 4 from September 18-20. | ||
| September 15 | ||
 TN | Kushpoint leaves. | |
 OR | Deelo and Willett leave. | |
 ATL | Arcitys joins. aBeZy, Cellium, and Simp will remain with the team for 2021. | |
 MIN | Accuracy, Attach, MajorManiak, and Priestahh join. | |
| ATL | MajorManiak and Priestahh leave. | |
| NY | Attach leaves. | |
| September 14 | ||
| F/A | JHaZe comes out of retirement. | |
 FFG | JHaZe (Streamer) leaves. | |
 CHI | Dashy joins. Envoy, FormaL, Scump, and Sender (Coach) will remain with the team for 2021. | |
| Call of Duty League 2021 competition moves to PC + controller. Challengers moves to crossplay + controller. | ||
| Call of Duty League 2021 Free Agency signing period begins. | ||
| Call of Duty League 2021 year begins. | ||
 INF | Team signs roster of  Black Dragons eSport. Dato, Gohan, Keyotk, Leozin, Menod, Pithon, and Titto join. | |
 BD | Roster is signed by Influence Rage. Jhony, Keyotk, Leozin, Menod, Pithon, Titto, and Whinter leave. | |
| September 13 | ||
| Call of Duty League 2020 league year ends at midnight (PDT). | ||
| Cellium Clayster in the Call of Duty League 2020 - All-Star Weekend 1v1. | ||
| Call of Duty League 2020 awards are announced. | ||
| Team Pros Team Casters in the CDL All-Star 2020 - Mobile Exhibition
. | ||
 CG | Gunsiii, Hunt, Nightmare, Pure, Ryza, and Viiox (Coach) leave. | |
| CHI | General will remain with the team for 2021. | |
 DG Esports  Bonafide in the Garena Major Series 2020 Season 3. | ||
 FunPlus Phoenix  TiGeR in the Garena Taiwan Summer Championship 2020
. | ||
 Daivo.FreeSlot  Sharper Esport in the Garena Ultimate Warfare 2020
. | ||
 Divinity.Uprising  NRX Jeremiah 29:11 in the ESL MSP Championship 2020
. | ||
| DG Esports, Daivo.FreeSlot, and FunPlus Phoenix qualify for the COD Mobile World Championship 2020 GR Final. | ||
| September 12 | ||
| Malik Forté & Dexy NAMELESS & Flo in CDL All-Star 2020 US Army 2v2 Face-Off. | ||
| September 11 | ||
 NexT | Cllyne, Getway, and LuKinas join. Horid rejoins. | |
| VrT | Cllyne leaves. | |
 INTZ | Arth, Dermec, Fachin, FmX, gds, Hawk, and M2 join. | |
| September 10 | ||
| NexT | DreeyK, Faake, Jouziin, STYL3, and Stukas (Coach) leave. | |
| Warz & Dreamz Vikkstar123 & C6 in Vikkstar's Warzone Showdown: Week 3. | ||
| VrT | Firi leaves. | |
| September 9 (approx.) | ||
 PAR | Op2 (Coach) leaves. | |
| September 9 | ||
 LAG | Vivid's contract is extended. | |
 TOR | Cammy and CleanX's contracts are extended. | |
| SEA | Octane's contract is extended. | |
| NY | Attach, Mack, and ZooMaa's contracts are extended. | |
 FLA | Fero, Owakening, and Skyz's contracts are extended. | |
| DAL | C6, Clayster, Huke, iLLeY, and Shotzzy's contracts are extended. | |
| CHI | Envoy, FormaL, Scump, and General's contracts are extended. | |
| ATL | aBeZy, Cellium, MajorManiak, Priestahh, and Simp's contracts are extended. | |
 OGLA | Drazah, Kuavo, and SlasheR's contracts are extended. | |
 LDN | Seany's contract is extended. | |
| FLA | Frosty and Maux leave. | |
| September 8 (approx.) | ||
 NME | FarMa leaves. | |
| September 8 | ||
| NY | Accuracy and Censor leave. | |
| DAL | Tommey leaves. | |
| CHI | Arcitys and Prestinni leave. | |
 CONN | MadCat joins permanently after loan from LDN Royal Ravens ends. Linney leaves. Nastie's loan from LDN Royal Ravens ends. | |
| LDN | Dylan, Skrapz, wuskin, Zer0, MadCat, Nastie, and Rated leave. | |
| LDN | MadCat and Nastie return from loan to Connect. | |
| OGLA | Hollow, Chino, Dashy, and Goonjar leave. | |
| F/A | SnakeBite comes out of retirement. | |
| PAR | Denz, Louqa, Shockz, Zed, Breszy, and Phantomz leave. | |
| CHI | x2Pac ThuGLorD (Analyst) leaves. | |
 6GBR | JHustleR leaves. | |
| VrT | Martino leaves. | |
| September 7 | ||
 OU | Cruelty joins. | |
| UYU | MentaL retires from Gears of War esports to compete in Call of Duty. | |
| MIN | Alexx, Asim, Assault, Exceed, SiLLY, GodRx, and TTinyy leave. | |
| PAR | KiSMET leaves. | |
| CHI | Gunless leaves. | |
| LAG | AquA, Blazt, Decemate, Saints, Lacefield, and Spart leave. | |
| NME | Lightning leaves. | |
 EXI | Nuker leaves. | |
 ASTR | Hypz leaves. | |
| September 6 | ||
| Options for 2021 player contracts must be exercised by end of day. | ||
 4LF4 Team  Sixth Gear BR in the ArenaOn Série A 2020 Season 3 Playoffs. | ||
| NY | Happy leaves. | |
sZ on top,  Truly, Gene Gaming, and Team Violence qualify for COD Mobile World Championship 2020 NA Final. | ||
 Cold Esports, WD White, French Infinity, and  U4X eSports qualify for COD Mobile World Championship 2020 WE Final. | ||
| EXI | Crawly leaves. | |
| September 5 | ||
| Decorated Champs 2 Champions and 2 Burgers in the Cheetowunga Lord of the Throwbacks 2020-09-05. | ||
 Black8 Team,  Piratas Invictus,  Zwan Gaming, and  Hypnos Gaming qualify for ArenaOn Série A 2020 Season 4. | ||
| SEA | Octane will remain with the team for 2021. | |
| September 4 | ||
| Symfuhny & Bloo Apex & MuTeX in Vikkstar's Warzone Showdown: Week 2. | ||
| SEA | Apathy, Pandur, Proto, Slacked, Enable, and TeddyRecKs (S&D Analyst) leave. | |
| NY | Temp leaves. | |
| LDN | wuskin leaves. | |
 NRG | HusKerrs (Streamer) joins. | |
 RGE | HusKerrs (Streamer) leaves. | |
| PAR | Joshh (Coach) leaves. | |
| DAL | C6, Huke, iLLeY, and Shotzzy will remain with the team for 2021. | |
| TOR | Cammy and CleanX will remain with the team for 2021. Classic, Brack, Loony, Lucky, Mayhem, and MettalZ leave. | |
| September 3 | ||
| DVT.MY | Smokii joins. | |
| September 2 | ||
| OGLA | JKap retires. | |
 TRI | Standy and Mochila (Head Coach) become restricted free agents. | |
| September 1 (approx.) | ||
 LAV | Creza, endurAAA, Fuzzn, Piero, and Rrazah leave. | |
 MH | Creative, Divinity, Hecful, Styled, and Vision leave. | |
 HRG | Koots, Phenom, Sher, Spike, and TBEDylan leave. | |
 CR | Kreyzo, Nadox, VriZix, Xelium, and ZiRoW leave. | |
 Lèsè | Astatix, Beastn, Imagine, Immense, and Jazhn leave. | |
 TSU | FrimJ, Izaac, JordJP, LeBrucey, Vadex, and Tyrrell (Coach) leave. | |
 VRTX | AliFSA, DavidR, Divvll, Seedy, and TwinzLK leave. | |
 VOLT | ATLAS, Cobra, Gabi, Loki, and ReeFleX leave. | |
 RiFt | BuZZO, CronusKun, Cruze, ManOfChicken, and Tyson leave. | |
 PRY | Archivs, Colinnator, Kyzer, MRuiz, and Nova leave. | |
 BBG | Cilantro, Groovy, JLags, Legal, and Uli leave. | |
| TN | SNLESS leaves. | |
 ATVI | TeeP (Analyst) leaves. | |
| September 1 | ||
 AA | Boards, Example, kLoH, SinnR, and Stolly leave. | |
| LAG | Bevils (Head Coach) and Ricky (Assistant Coach) will remain with the team for 2021. | |
| LAG | Ricky (Assistant Coach) is no longer listed on the official roster as substitute. | |
| NME | Jumpy leaves. | |
 UG | Apox, ProFeeZy, and TcM leave. | |
| OR | Pentagrxm, Stamino, and Gunna (Coach) leave. | |
| LDN | Jurd leaves. | |
| DAL | Clayster becomes restricted free agent. | |
| NRG | Symfuhny (Streamer) leaves. | |