Ruben-Loftus Cheek limped off with a suspected ankle problem during Chelsea’s 3-0 friendly victory over New England Revolution in the US.
The England midfielder hobbled off after going down in the second half and was later seen on crutches, raising concerns he will miss the Europa League Final against Arsenal.
The Blues were in the United States for a charity match as part of the Club’s Say No To Antisemitism campaign.
Before the fixture, Chelsea boss Maurizo Sarri lauded the game’s purpose, but conceded that he felt his players needed to rest.
“We go there for a good reason I think, so as a man I am very happy to go there,” Sarri said.
“As a coach, of course, I am a little bit worried because I know very well that the team now needs rest.
“So it is not the best way to prepare for the final, I think.”
Nonetheless, Sarri started a strong eleven at the Gillete Stadium in Foxborough, Massachusetts, where club owner Roman Abramovich also attended on Wednesday night.
Ross Barkley opened the accounts with a third-minute goal before Oliveier Giroud made it 2-0 before the half-hour mark, heading from a Davide Zappacosta cross.
Sarri made six substitutions at half-time, among them were Loftus-Cheek who replaced Mateo Kovacic.
Barkley was back at it again with the third goal of the night just after the hour, though celebrations did not last long as Loftus-Cheek went to ground with what appeared to be an ankle problem.
Chelsea’s Academy Player of the Year Conor Gallagher came on for the injured midfielder.
The Blues take on London rivals Arsenal for the Europa League title in Baku on May 29.