Worcester Warriors head coach Rory Duncan has described Saturday’s European Rugby Challenge Cup Pool 2 tie at Ospreys as “our toughest challenge in the competition so far”.

The Round 5 match at the Liberty Stadium pits the group’s top two against one another, with Worcester just two points ahead of the Welsh region and one round left, when the English club host Stade Français Paris.

“We are facing our toughest challenge in the competition so far,” Duncan said at Worcester’s pre-match media conference. “Ospreys have proven that at home they are a tough team to play.

“It will be a different game to the one we had against them at Sixways in October. They will have some personnel changes and when they are at home, they are on their game.

“They are physical team who play a fast brand of rugby. They also have an intelligent kicking game, which is something we will have to manage.”

Worcester have won three of their four Pool 2 games, with their sole defeat coming at Pau in Round 3 by a 21-6 margin and their victories including a hard-fought 27-21 home success against Ospreys in Round 2.

“The games have been competitive; we’ve not had an easy game,” he added. “Stade away was a tough outing, but we got a great result there. We then beat Ospreys at home the following week.

“The away game at Pau didn’t go our way, but we managed to turn things around in the return match here.

“But this week’s game is going to be a little bit different. It means a lot to both teams.”