Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 12/2020 |  | Bradley Wright-Phillips | FW |  | Los Angeles FC | Los Angeles |
| 12/2020 |  | Evan Bush | GK |  | Vancouver Whitecaps | Vancouver |
| 12/2020 | | Jon Kempin | GK |  | San Diego Loyal | San Diego Loyal |
| 10/2020 |  | Krisztián Németh | FW |  | FC DAC 1904 | DAC 1904 |
| 08/2020 | | Fatai Alashe | MF |  | FC Cincinnati | Cincinnati |
| 08/2020 | | Grant Lillard | DF |  | Inter Miami CF | Inter Miami |
| 08/2020 |  | Emmanuel Boateng | MF |  | D.C. United | DC United |
| 08/2020 | | Catherine Hill | AT-C |  | USC Trojans | USC Trojans |
| 07/2020 |  | Axel Sjöberg | DF |  | San Antonio FC | San Antonio FC |
| 02/2020 | | Andrew Tarbell | GK |  | San Jose Earthquakes | Earthquakes |
| 02/2020 |  | Derrick Etienne | MF |  | New York RB | New York RB |
| 01/2020 |  | Fanendo Adi | FW | | FC Cincinnati | Cincinnati |
| 01/2020 | | Sebastian Berhalter | MF | |||
| 01/2020 | | Aidan Morris | MF | |||
| 01/2020 | | Danny Griffin | MF | |||
| 01/2020 |  | Miguel Berry | FW |  | San Diego Toreros | USD Toreros |
| 01/2020 |  | Chris Cadden | MF |  | Oxford United | Oxford United |
| 01/2020 | | Matt Lampson | GK |  | Los Angeles Galaxy | L.A. Galaxy |
| 01/2020 | | Remi Prieur | GK | |||
| 01/2020 |  | Vito Wormgoor | DF |  | SK Brann | SK Brann |
| 01/2020 |  | Lucas Zelarayán | MF |  | UANL Tigres | Tigres |
| 01/2020 | | Tim Hanley | GK-CO |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 08/2020 | | Miguel Berry | FW | | San Diego Loyal | San Diego Loyal |
| 02/2020 | | J.J. Williams | FW |  | Birmingham Legion | Legion FC |
| 02/2020 | | Remi Prieur | GK |  | Sporting Kansas City 2 | Kansas City 2 |
| 01/2020 | | Wil Trapp | MF | | Inter Miami CF | Inter Miami |
| 01/2020 | | Connor Maloney | DF | | San Antonio FC | San Antonio FC |
| 01/2020 | | Alex Crognale | DF | | Birmingham Legion | Legion FC |
| 01/2020 |  | David Guzmán | MF |  | Deportivo Saprissa | Saprissa |
| 01/2020 | | David Accam | FW |  | Nashville SC | Nashville SC |
| 01/2020 |  | Romario Williams | FW |  | Miami FC | Miami FC |