2017 Seattle Sounders FC season
The 2017 Seattle Sounders FC season is the club's forty-third season of existence, and their ninth in Major League Soccer, the top flight of American soccer. The Sounders entered the 2017 season as the defending MLS Cup champions. The 2017 season is Brian Schmetzer's first full MLS season as head coach of the Sounders.
Background
Current roster
Competitions
Preseason
2017 Desert Friendlies
2017 Carolina Challenge Cup
Major League Soccer
League tables
Western Conference
Overall
Results summary
Results by matchday
Matches
MLS Cup Playoffs
Western Conference Semifinals
Western Conference Finals
MLS Cup Final
Mid-season friendlies
U.S. Open Cup
Statistics
Appearances and goals
Numbers after plus-sign denote appearances as a substitute.– S2 player
Top scorers
Disciplinary record
Honors and awards
MLS Comeback Player of the Year
MLS Goal of the Week
MLS Save of the Week
MLS Team of the Week
MLS Coach of the Week
Transfers
For transfers in, dates listed are when Sounders FC officially signed the players to the roster. Transactions where only the rights to the players are acquired are not listed. For transfers out, dates listed are when Sounders FC officially removed the players from its roster, not when they signed with another club. If a player later signed with another club, his new club will be noted, but the date listed here remains the one when he was officially removed from Sounders FC roster.In
| No. | Pos. | Player | Transferred From | Fee/Notes | Date | Source |
| 35 |  San Jose Earthquakes | Selected with 20th pick in 2016 MLS Re-Entry Draft | ||||
| 19 |  Montreal Impact | Traded for allocation money | ||||
| 17 | Houston Dynamo | Traded for allocation money | ||||
| 12 | UCLA | Signed HGP Deal | ||||
| 23 | Washington | Signed HGP Deal | ||||
| 5 | Seattle Sounders FC 2 | Free | ||||
| 4 |  Guangzhou R&F | Free | ||||
| 21 | Seattle Sounders FC 2 | Free | ||||
| 32 | Seattle Sounders FC 2 | Free | ||||
| 18 |  SBV Vitesse | Free | ||||
| 8 |  Sporting de Gijón | Free | ||||
| 27 | D.C. United | Traded for a fourth-round pick in the 2018 MLS SuperDraft | ||||
| 16 | Montreal Impact | Traded for a fourth-round pick in the 2019 MLS SuperDraft |
Draft Picks
Draft picks are not automatically signed to the team roster. Only those who are signed to a contract will be listed as transfers in. Only trades involving draft picks and executed after the start of 2017 MLS SuperDraft will be listed in the notes.| Date | Player | Number | Position | Previous Club | Notes | Ref |
| January 13, 2017 | Brian Nana-Sinkam | DF | Stanford | MLS SuperDraft 1st Round Pick | ||
| January 13, 2017 | Dominic Oduro | DF |  FC Nordsjælland | MLS SuperDraft 2nd Round Pick | ||
| January 17, 2017 | Doug Goodman | MF | Georgetown | MLS SuperDraft 3rd Round Pick ; Acquired from D.C. United in exchange for midfielder David Estrada | ||
| January 17, 2017 | Jake Stovall | DF | Wright State | MLS SuperDraft 3rd Round Pick | ||
| January 17, 2017 | Kyle Bjornethun | DF | Seattle University | MLS SuperDraft 4th Round Pick |
Out
| No. | Pos. | Player | Transferred To | Fee/Notes | Date | Source |
| 39 | Waived | |||||
| 12 | Retired | Waived | ||||
| 8 |  BK Häcken | Waived | ||||
| 9 | Retired | Waived | ||||
| 23 |  Viktoria Plzeň | Waived | ||||
| 17 | Tampa Bay Rowdies | Waived | ||||
| 31 | Tampa Bay Rowdies | Waived | ||||
| 22 | Orange County SC | Waived | ||||
| 4 | Atlanta United FC | Waived, Traded for $50k general allocation money | ||||
| 5 | Reno 1868 FC | Waived | ||||
| 15 | Houston Dynamo | Waived; Second pick in 2016 MLS Re-Entry Draft | ||||
| 20 | Retired | Waived | ||||
| 18 | Waived | |||||
| 16 |  Cerro Porteño | Waived | ||||
| 80 | FC Cincinnati | Out on Loan | ||||
| 8 |  San Martín | End of Contract | ||||
| 80 | Umeå FC | Waived |