Everton boss Roberto Martinez is surprised by James McCarthy's latest injury concern.
The 24-year-old was sent home by the Republic of Ireland last week after complaining of a hamstring problem and is a doubt for Saturday's visit of West Ham.
"We need to assess it. Maybe it's managing the work he does in training," Martinez told the Liverpool Echo.
"We need to find the right formula because we need to make sure we don't get these sort of injuries on a regular basis.
"James has played a huge amount of games and is still a very young man.
"He's a super fit boy and he shouldn't be picking up these sort of knocks. He's had this same injury before but not in the same leg.
"It's partly normal phases of development and growing into the physical demands of your role."
