Ghana striker David Accam doubtful for Chicago Fire clash against Dynamo Houston on Friday

Chicago Fire striker David Accam is a major doubt for Friday's game against Dynamo Houston.

The 24-year-old is suffering from a hamstring injury and now racing against time to be fit for the big game in the MLS.

Manager Frank Yallop does not want to rush the Ghana international and will assess his fitness before making a late decision.

Accam missed the side's game against DC United last Wednesday and has been ruled out of the US Open round of 16 clash Charlotte Independence on Tuesday.