Union forward-midfielder Sebastien Le Toux suffered a concussion in Wednesday's 2-1 Round of 16 U.S. Open Cup win over the New York Red Bulls and won't be available for Saturday's Major League Soccer game in Houston against the Dynamo.
Le Toux hit his head in a collision in the 79th minute and left the game. He played up top because the Union's top two forwards, C.J. Sapong and Fabian Herbers, were out with injuries.
Le Toux has not missed an MLS game this season for the Union, appearing in all 17 and starting 12. He has two goals and a team-high five assists.