The NSW Waratahs stormed to a 46-10 win over the Cats but a potentially serious injury to star fullback Mat Rogers cast a dark shadow over their Super 12 rugby win at Aussie Stadium.

Rogers' Super 12 season is in doubt after he was assisted from the field on a medi-cab after his left ankle twisted beneath him when he was tackled in the final minute of the six-try romp.

He was taken for x-rays with possible ligament damage.

NSW coach Ewen McKenzie said it was "unlikely" Rogers would join the NSW side which flies out to South Africa , where they play two matches.

"We're aren't sure about the injury but he's in a lot of pain," McKenzie said.

"He got his toe caught as he was tackled ... we're just hoping for his sake it's not a long term injury."

In another blow the Waratahs have also lost winger Milton Thaiday, who requires further tests on a mystery stomach bug and will miss the South African games.

In some much-needed good news, veteran Wallaby Matt Burke came through his first Super 12 match unscathed after recovering from a shoulder injury, coming off the bench for the final 20 minutes.

Although Burke played five-eighth, he's a ready-made replacement for Rogers with the ability to play fullback and kick goals.

Before the injury Rogers delivered a man-of-the-match performance, continuing his swash-buckling form this year.

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