Chelsea midfielder Ruben Loftus-Cheek is not currently training with his teammates.
The club are beginning their preparations for the rest of the domestic and European club season.
Loftus-Cheek was injured prior to the World Cup, which meant he could not go to the tournament with England.
Football.london states that Loftus-Cheek has a calf problem, and is with the squad in Abu Dhabi, but will not be training as yet.
The club do not want to rush him back to fitness, only to exacerbate the issue.
Wesley Fofana and Ben Chilwell are two others who are continuing their recovery from injuries.