Injury news in soccer is notoriously sketchy, so while the below information should be used as a guide, always check the confirmed lineups before every match.
v. 
Toyota Park
Wednesday, August 26 at 8:30 p.m. EDT
Chicago Fire
Questionable:Gilberto (groin), Adailton (groin), Mike Magee (knee), Michael Stephens (illness)
New York Red Bulls
Suspension:Damien Perrinelle
Out:Chris Duvall (leg)
Questionable:Kemar Lawrence (hamstring), Ronald Zubar (groin)
v. 
Dick's Sporting Goods Park
Wednesday, August 26 at 9:00 p.m. EDT
Colorado Rapids
Doubtful:Joe Greenspan (back), Lucas Pittinari (hamstring), James Riley (concussion), Luis Solignac (hamstring)
Questionable:Jared Watts (undisclosed)
Houston Dynamo
Doubtful:Taylor Hunter (knee), Jermaine Taylor (thigh)
Questionable:Giles Barnes (Achilles), DaMarcus Beasley (calf), Ricardo Clark (hamstring), Rob Lovejoy (hamstring), Raul Rodriguez (heel), Kofi Sarkodie (knee)
