Waratahs and Wallabies prop Benn Robinson has been ruled out of Rugby for the rest of the season ruling him out of the TriNations and the world cup.

The 26-year-old underwent an arthroscopy in Sydney this morning after stumbling at Wallabies training yesterday and feeling a “click” in his knee.

While the injury at first didn’t appear serious, further examination today has shown that he has torn the anterior cruciate ligament of his right knee, while also damaging a meniscus in the joint.

An operation in the coming days will be required to repair the damage, with the timeline required for recovery curtailing the rest of his season.

“It’s disappointing news for Benn, disappointing news for the rest of the squad and for Australian Rugby as a whole,” said Wallabies coach Robbie Deans. “No one likes to see injuries like this.

“The seemingly innocuous circumstance in which it occurred only adds to the frustration, but injuries have always been a part of the game.

“When the door closes for one player, it opens for another and I’m sure the other front rowers we have will step up to fill the void Benn leaves.

“As far as Benn goes, we wish him all the best for his recovery and will be providing him with any assistance he needs.”

Robinson’s Waratahs teammate Al Baxter is one of two props who have joined Wallabies at training today and was recently involved in the recent national scrum camps.

A decision on which player replaces Robinson in the Wallabies squad for the Samoa Test will be made before the weekend.