Seattle Sounders FC 2021
| P | # | Player | Born | Height | Weight | Contract | |
|---|---|---|---|---|---|---|---|
| GK | Charlie Lyon | 1992-04-10 | 188 | 97 | |||
| GK | Stefan Frei | 1986-04-20 | 195 | 89 | |||
| GK | Troy Perkins | 1981-07-29 | 188 | 86 | |||
| D | Andres Correa | 1994-01-29 | 178 | 79 | |||
| D | Chad Marshall | 1984-08-22 | 191 | 89 | |||
| D | Damion Lowe | 1993-05-05 | 191 | 79 | |||
| D | Dylan Remick | 1991-05-19 | 183 | 75 | |||
| D | Jimmy Ockford | 1992-06-10 | 186 | 84 | |||
| D | Leonardo González | 1980-11-21 | 186 | 76 | |||
| D | Oniel Fisher | 1991-11-22 | 175 | 70 | |||
| D | Tyrone Mears | 1983-02-18 | 180 | 74 | 2014 | ||
| D | Zach Scott | 1980-07-02 | 180 | 79 | |||
| M | Aaron Kovar | 1993-08-14 | 178 | 73 | |||
| M | Andreas Ivanschitz | 1983-10-15 | 183 | 79 | |||
| M | Andy Rose | 1990-02-13 | 188 | 77 | |||
| M | Brad Evans | 1985-04-20 | 185 | 73 | |||
| M | Christian Roldan | 1995-06-03 | 173 | 74 | |||
| M | Gonzalo Pineda | 1982-10-19 | 168 | 75 | |||
| M | Magnus Wolff Eikrem | 1990-08-08 | 184 | 69 | 2017-12-31 | ||
| M | Marco Pappa | 1987-11-15 | 178 | 70 | |||
| M | Michael Azira | 1987-08-22 | 168 | 72 | |||
| M | Nicolas Lodeiro | 1989-03-21 | 173 | 69 | 2016 jun | ||
| M | Osvaldo Alonso | 1985-11-11 | 180 | 75 | |||
| F | Clint Dempsey | 1983-03-09 | 187 | 84 | 2017 dec | ||
| F | Hérculez Gómez | 1982-04-06 | 178 | 75 | |||
| F | Lamar Neagle | 1987-05-07 | 180 | 75 | |||
| F | Nelson Valdez | 1983-11-28 | 178 | 71 | 2016 jun | ||
| F | Victor Mansaray | 1997-02-22 | 178 | 81 |
| Date | Player | From | To | Status | Src |
|---|---|---|---|---|---|
| 31.Jan | Magnus Wolff Eikrem (M) | Free Agent | Seattle Sounders FC | Confirmed | |
| 31.Jan | Gustav Svensson (M) | Guangzhou R&F F.C. | Seattle Sounders FC | Confirmed | |
| 3.Jan | Erik Friberg (M) | Seattle Sounders FC | BK Häcken | Confirmed | |
| 31.Dec | Jimmy Ockford (D) | New York Cosmos | Seattle Sounders FC | Confirmed | |
| 31.Dec | Damion Lowe (D) | Minnesota United | Seattle Sounders FC | Confirmed | |
| 28.Jul | Nicolas Lodeiro (M) | Boca Juniors | Seattle Sounders FC | Confirmed | |
| 26.Mar | Hérculez Gómez (F) | Toronto FC | Seattle Sounders FC | Confirmed | |
| 8.Aug | Nelson Valdez (F) | Eintracht Frankfurt | Seattle Sounders FC | Confirmed | |
| 4.Aug | Andreas Ivanschitz (M) | Levante UD | Seattle Sounders FC | Confirmed | |
| 30.Jun | Erik Friberg (M) | Esbjerg FB | Seattle Sounders FC | Confirmed |