Everton's Chinese star Li Tie may have suffered a setback in his recovery from the broken leg which has kept him out of action for several months.
The 27-year-old midfielder was carried off in a comeback match for Everton reserves against Bolton on Tuesday.
Li Tie lasted only 40 minutes before being helped off after a collision.
Everton physiotherapist Matt Connery administered treatment on the touchline and Li Tie left the ground on crutches before going to hospital for a scan.
Reserve team manager Andy Holden said: "We all hope that the injury is not a serious one."