Schalke and USMNT midfielder Weston McKennie limped off the pitch during the second half of a friendly against Ecuador on Thursday in Florida.
McKennie appeared to twist his ankle shortly after being called for a foul in the match, which stood 0-0 at the time.
[ MORE: Hazard, Real, and the back-up plan ]
He left the match with trainer help, and was eventually carted to the bench while seated on a stretcher.
A key piece of the program’s future, the 20-year-old midfielder has been a utility knife in the Bundesliga, playing everywhere from right back to left mid.
Only six players have played more league minutes for Schalke than McKennie, who earned his eighth cap on Thursday.