Everton midfielder Jack Rodwell's recurring hamstring injuries remain a fear for the club.
The England international has been sidelined for the fourth time this season with a similar fitness problem after missing the FA Cup draw with Sunderland.
Rodwell has played just 19 matches for club and country this campaign and the 21-year-old's injuries could be associated to growth and muscle development.
Everton are understandably concerned by his repeated issues and, with the player set to sit out Wednesday night's game against Arsenal, they hope a period of rest will be beneficial.
David Moyes' assistant manager, Steve Round, said: "We think it is something to do with the nervous system.
"Maybe rest or an injection into a nerve to get the inflammation down will help."
Round added: "He is working hard to strengthen his hamstring.
"We have to keep him going, we have to make sure that he is doing all the right things."
Moyes himself admitted his worries about Rodwell in February after he had suffered a third injury in as many months.
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