Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 09/2018 |  | Kevin Ellis | DF | |||
| 08/2018 | | Bill Hamid | GK |  | FC Midtjylland | Midtjylland |
| 08/2018 |  | Vytautas Andriuškevičius | DF |  | Portland Timbers | Portland |
| 07/2018 |  | Wayne Rooney | FW |  | Everton FC | Everton |
| 03/2018 |  | Dane Kelly | FW |  | Richmond Kickers | Richmond Kickers |
| 03/2018 |  | Joseph Mora | DF |  | Deportivo Saprissa | Saprissa |
| 02/2018 |  | Yamil Asad | MF |  | Vélez Sarsfield | Vélez Sársfield |
| 02/2018 | | Oniel Fisher | DF |  | Seattle Sounders | Seattle SFC |
| 01/2018 |  | David Ousted | GK |  | Vancouver Whitecaps | Vancouver |
| 01/2018 |  | Júnior Moreno | MF |  | Zulia FC | Zulia FC |
| 01/2018 |  | Frédéric Brillant | DF |  | New York City FC | NY City FC |
| 01/2018 | | Ulises Segura | MF | | Deportivo Saprissa | Saprissa |
| 01/2018 | | Darren Mattocks | FW | | Portland Timbers | Portland |
| 01/2018 | | Brian Goodstein | AT-C |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 07/2018 | | Patrick Mullins | FW |  | Columbus Crew | Columbus Crew |
| 01/2018 | | Bill Hamid | GK | | FC Midtjylland | Midtjylland |