Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 10/2009 |  | Steve Cronin | GK |  | Portland Timbers | Portland |
| 09/2009 | | Bill Hamid | GK |  | D.C. United U19 | D.C. United U19 |
| 08/2009 |  | Tiyi Shipalane | MF |  | Penn FC | Penn |
| 08/2009 |  | Julius James | DF |  | Houston Dynamo | H. Dynamo |
| 07/2009 | | Lawson Vaughn | DF |  | CD Chivas | Chivas USA |
| 07/2009 | | Danny Szetela | MF |  | Brescia Calcio | Brescia |
| 04/2009 | | John DiRaimondo | MF |  | Colorado Rapids | Colorado Rapids |
| 02/2009 |  | Dejan Jaković | DF |  | Crvena Zvezda | Crv. Zvezda |
| 02/2009 | | Andrew Jacobson | MF | |||
| 01/2009 |  | Miloš Kocić | GK | |||
| 01/2009 |  | Rodney Wallace | DF | |||
| 01/2009 | | Mike Graczyk | GK | |||
| 01/2009 | | Josh Wicks | GK |  | Los Angeles Galaxy | L.A. Galaxy |
| 01/2009 |  | David Habarugira | DF | |||
| 01/2009 | | Avery John | DF |  | Fort Lauderdale Strikers | Ft. Lauderdale |
| 01/2009 | | Ely Allen | MF | | Los Angeles Galaxy | L.A. Galaxy |
| 01/2009 | | Brandon Barklage | MF | |||
| 01/2009 |  | Fred | MF |  | Wellington Phoenix | Wellington Ph. |
| 01/2009 |  | Christian Gómez | MF | | Colorado Rapids | Colorado Rapids |
| 01/2009 | | Chris Pontius | MF |  | UC Santa Barbara Gauchos | UCSB Gauchos |
| 01/2009 |  | Ange N'Silu | FW |  | FC Le Mont | Le Mont |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 07/2009 | | Ryan Miller | DF |  | Ljungskile SK | Ljungskile SK |
| 07/2009 |  | Francis Doe | FW |  | Al Ahly SC | Al Ahly SC |
| 03/2009 | | Mike Zaher | DF |  | San Jose Earthquakes | Earthquakes |
| 01/2009 |  | Ibrahim Koroma | DF |  | Motala AIF | Motala AIF |
| 01/2009 |  | Gonzalo Martínez | DF |  | Atlético Huila | Atlético Huila |
| 01/2009 | | Gonzalo Peralta | DF |  | Unión de Santa Fe | Unión |
| 01/2009 | | Marcelo Gallardo | MF |  | River Plate | River Plate |
| 01/2009 |  | Iván Guerrero | MF | | Colorado Rapids | Colorado Rapids |
| 01/2009 | | Domenic Mediate | MF |  | Puerto Rico Islanders | Islanders |
| 01/2009 | | Quavas Kirk | FW | | Portland Timbers | Portland |