Carlos Costly suffered a rib injury against Jamaica.
The veteran player is still recovering from a rib injury he suffered after a collision in the 1-0 loss against Jamaica on Monday.
According to Concacaf.org, Costly continually rubbed his right side and appeared to have limited range of motion when he tried to run and turn. Trainers spent some time applying gauze or tape to the injury.
"When I twist or bend, it hurts plenty," Costly said to Concacaf.org.
"(Trainers are) using a homemade solution. I don't know what it is. It's ice with hot (towels). Then he puts on a patch that seems to help. I think it was a bit more swollen (Tuesday) and (Wednesday) it is a bit better."
Costly is doubtful for his team's quarterfinals match against Costa Rica on Saturday at the New Meadowlands Stadium.
"I still have some swelling but let's hope that it will be better in the coming days," Costly added.
"The truth is that it's an important game and I have to be well before Saturday. We have to take (the injury) seriously."
- Terra Estados Unidos