STAR Port Adelaide midfielder Tom Rockliff has declared himself a certain starter for Saturday's encounter with Richmond at Adelaide Oval.

Rockliff flew back to Adelaide on Wednesday afternoon, confident he will overcome a concussion in time to face the Tigers.

FULL INJURY LIST Who's ruled out and who's a test?

The 29-year-old stayed in Brisbane after suffering a head knock in the Power's 17-point loss to the Lions at The Gabba last Saturday night.

"Yeah, 100 per cent I will play this week," Rockliff told reporters.

"I'll train tomorrow with the boys, but I feel fine."

MATCH PREVIEW Port Adelaide v Richmond

Rockliff has been one of the Power's best this season, racking up 44 and 37 disposals in their wins against Melbourne and Carlton in rounds one and two respectively.

He had 15 touches against the Lions before he was concussed in the third quarter and didn't play any further part in the game.

Four-time All-Australian forward Robbie Gray also believes he will pass a fitness test on his shoulder and will take his spot in the side.