WORCESTER Warriors' head coach Jonathan Thomas has offered an update on a number of injury issues ahead of his side's trip to reigning Premiership champions Harlequins this weekend.

Full-back Melani Nanai was the main concern after the bonus-point win over London Irish.

Nanai picked up an injury to his Achilles in the first-half but was given time to run it off and even scored Warriors' third try of the afternoon right on half-time.

But he was still struggling after the break and hobbled off to be replaced by Jamie Shillcock after 50 minutes.

Thomas suggests he is a doubt for the Quins fixture but will face a fitness test on Thursday to determine his involvement.

"It's not serious, we don't think," he said.

"His Achilles is a little bit sore and it's an eare of the body you have to be a bit careful around so we will assess him on Thursday and then make a call."

New scrum-half Willi Heinz cramped up on Saturday and was replaced early in the second-half but Thomas confirmed the England player is fit to be involved this weekend.

Elsewhere in the squad, summer arrival Sione Vailanu has suffered a slight calf tear and will not be fit enough for the next two games.

"Sione had made a big impact here already and has been training so well," said Thomas.

"He's been looking really good but unfortunately he has picked up a minor calf tear a week after that Connacht game. 

"We are hoping he will be fit for Gloucester next week."

Former Welsh centre Ashley Beck has recovered from injury to be available for selection again.

Anton Bresler is a month away from a return with a foot problem whilst Andrew Kitchener is still a couple of games away from a return, with Exeter the likely game for him.