Australia flanker David Pocock will miss the rest of the season after undergoing knee surgery for the second time in 12 months.

The Brumbies back-rower re-ruptured his anterior cruciate ligament during Saturday's match against the Western Force and will now miss the remainder of the Super Rugby season.

The injury is also almost certain to rule the 25-year-old out of Australia's northern hemisphere tour later this year as he attempts to regain his place in time for the 2015 World Cup.

"Devastated but trying to keep perspective," he wrote on Twitter. "So appreciative of all the support I've received. Thank you all."

"To have [David Pocock] sitting out the rest of our campaign is bitterly disappointing" - Brumbies director of rugby Laurie Fisher

His place in the international set up has been taken by Michael Hooper but Brumbies director of rugby Laurie Fisher has backed Pocock to come back strong in 2015.

"Having worked so hard to get himself back to peak physical condition over the last 12 months it's impossible not to feel for David," Fisher told the Brumbies website.

"Only yesterday he was speaking about how much enjoyment he'd been getting out of his rugby this year so to have him sitting out the rest of our campaign is bitterly disappointing for him and the rest of the team.

"What we must remember is that David is still young and will have more opportunities to play professional rugby in the future.

"Guys like Ben Mowen and Christian Lealiifano are living proof that you can make a successful comeback from a recurring injury and I'd expect to see David bounce back in the same way."