WORCESTER Warriors will have a nervous wait to understand the extent of the injury to fly-half Owen Williams following the 23-31 defeat to Gloucester on Saturday.

Williams slipped whilst going for a kick at goal in the second-half and limped off instantly holding his hamstring.

He was seen holding ice to the back of his right leg on the replacement bench and head coach Jonathan Thomas confirmed it looked "pretty bad".

"It was a hamstring for Owen," he said.

"As he went for the kick, he felt it go but we will have to see what happens over the next few days but it looks pretty bad."

The injury capped off what was a pretty disappointing afternoon for Worcester, who failed to take any points from a league fixture for the first time this season.

Thomas indicated the kicking battle was key on what was a wet and miserable day at Sixways but admits his side weren't able to dominate in that area like they have in previous games.

"It was a very typical derby game, a game of chess in that first-half if you like," he added.

"A lot of kicking, the weather conditions dictated that but they won the 50:50s. I think in the first two rounds our aerial kicking game, we have been better than both of our opponents but today we weren't.

"Their kick chase, they put a lot of pressure on us and I don't think we put enough on them, it was a little bit of an arm chair ride for their nine.

"Those little 50s that they were winning, and that's what gave them the kick lead at half-time."

Warriors were 12-3 down at the break but responded well to reduce the gap to just three points with 52 minutes on the clock.

But tries from Ben Morgan, Jason Woodward and Chris Harris in the second-half sealed the win for the visitors.

Warriors had their captain Ted Hill sent-off with time running out after a tip tackle on Gloucester's Lloyd Evans but Thomas suggested that he would review the incident.

"I will have to look at it again to make judgement," he added.

"But Ted's been kicked in the face. I think there has to be mitigation. So if Ted has been kicked in the face, I need to go away and look at it carefully, but at the moment I don't know, I need to watch it again."

Welshman Thomas admits it was a tough day at the office but is aware that his new side are still developing.

"There is no need for a reality check," he said.

"Where we have come as a group, we knew there would be ups and downs along the way.

"We are disappointed not to win a derby game at home, naturally. We will have to own that performance.

"They won the 50:50s in a derby game, and that's disappointing thing but we have to learn and grow more as a team."