Chester has played just three times this season

Super League side Hull Kington Rovers are mystified by the calf injury that continues to dog Chris Chester.

The back rower has not played since mid-February and was forced to pull out of Sunday's Challenge Cup tie at Workington Town just before kick-off.

Rovers coach Justin Morgan said: "He passed all the tests on his calf but it felt a bit sore in the warm-up.

"We'll get the medical staff to have a look at it but poor Chezzie is a bit disillusioned at the moment."

The England international and former Halifax, Wigan and Hull FC playmaker has not played since sustaining a calf muscle tear during the victory over the Catalans Dragons.

It's not in the same spot as the original injury so that's a little bit baffling and he's been unlucky again Hull KR coach Justin Morgan

Chester has been on the brink of making a return several times, only to fall short at the last moment, and Morgan says the cause of the injury is proving hard to nail down.

He added: "We just didn't want to risk it and he had no problem with his acceleration but he just had a little bit of an uneasy feeling in the calf.

"It's not in the same spot as the original injury so that's a little bit baffling and he's been unlucky again."