D.C. United, which has started the season with three loss, has more injury problems. Central defender Dejan Jakovic will be out four to six weeks with a fractured clavicle.
Attacker Chris Pontius has been ruled out for four to six weeks with a hamstring strain.
Jakovic was injured April 10 against Philadelphia when he was kicked by teammate Julius James as the pair pursued a bouncing ball. Jakovic lowered his head when James' kick struck him in the upper body and head.
Midfielder Clyde Simms and defender Juan Manuel Pena have hamstring injuries. Also out are defenders Marc Burch (foot) and Bryan Namoff (post-concussion).