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Squad of Seattle Sounders for Major League Soccer 2021
Hide players that have left or changed #
| # | | | | Player | | Height | |
Age | | | Position |
| 3 | |
 | |
 Arreaga
| | 1.83 | | 26 | | | DF Centre-back |
| 5 | |
 | |
 Tolo, Nouhou
| | 1.78 | | 23 | | | DF Left-back |
| 6 | |
 | |
 João Paulo, M
(c) | | 1.71 | | 30 | | | MF Box-to-Box midfielder |
| 7 | |
 | |
 Roldan, C
(c) | | 1.73 | | 25 | | | MF Right-midfield/Attacking midfielder |
| 8 | |
| |
 Delem
| | 1.80 | | 28 | | | MF Defensive midfielder/Centre-back |
| 9 | |
 | |
 Ruidíaz
| | 1.67 | | 30 | | | FW Striker |
| 10 | |
 | |
 Lodeiro
(c) | | 1.73 | | 32 | | | MF Attacking midfielder |
| 11 | |
| |
 Smith, Brad
| | 1.77 | | 27 | | | DF Left-back |
| 12 | |
 | |
 Montero, F
(c) | | 1.76 | | 33 | | | FW Striker |
| 13 | |
 | |
Morris, Jordan
In 31may | | 1.81 | | 26 | | | FW Left-wing/Striker |
| 16 | |
 | |
 Roldan, Alex
| | 1.78 | | 24 | | | DF Right-back/Right-midfield |
| 17 | |
| |
Bruin
| | 1.88 | | 31 | | | FW Striker |
| 18 | |
| |
Richey
| | 1.85 | | 28 | | | GK |
| 20 | |
| |
 Benezet
In 05aug | | 1.70 | | 30 | | | FW Left-wing/Attacking midfielder |
| 21 | |
 | |
Baker-Whiting
In 12may | | 1.80 | | 16 | | | MF Either side midfield |
| 22 | |
 | |
Rowe, K
| | 1.73 | | 29 | | | MF Box-to-Box midfielder |
| 23 | |
| |
Léo Chú
In 05aug | | 1.78 | | 21 | | | FW Left-wing |
| 24 | |
 | |
 Frei, S
(c) | | 1.91 | | 34 | | | GK |
| 26 | |
| |
Thomas, Andy
In 21may | | 1.88 | | 22 | | | GK |
| 27 | |
| |
O'Neill, Shane (1993)
| | 1.88 | | 27 | | | DF Centre-back |
| 28 | |
 | |
Gómez Andrade
| | 1.87 | | 28 | | | DF Centre-back |
| 30 | |
| |
Cleveland
Out 03may | | 1.88 | | 26 | | | GK |
| 30 | |
| |
Cleveland
In 11may | | 1.88 | | 26 | | | GK |
| 35 | |
| |
Villanueva, Alex
In 18may | | 1.70 | | 18 | | | DF |
| 45 | |
| |
Dobbelaere
| | 1.75 | | 18 | | | MF Right-midfield |
| 73 | |
 | |
 Vargas, Obed
In 18may | | 1.75 | | 15 | | | MF Box-to-Box midfielder |
| 75 | |
| |
Leyva, D
| | 1.78 | | 17 | | | MF Defensive midfielder |
| 84 | |
| |
Atencio
| | 1.85 | | 19 | | | MF Defensive midfielder |
| 87 | |
| |
Ocampo-Chavez
Out 07jul | | 1.75 | | 19 | | | FW Striker |
| 92 | |
| |
Cissoko, A
In 11may | | 1.90 | | 21 | | | DF Centre-back |
| 94 | |
| |
Medranda
| | 1.73 | | 27 | | | DF Left-back/Left-midfield |
| 97 | |
| |
Alvarez, Juan (2004)
In 18may | | 1.68 | | 16 | | | MF |
| 98 | |
| |
Adeniran, S
In 18jul | | 1.93 | | 22 | | | FW |
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