Injured St Kilda skipper Nick Riewoldt could be passed fit as early as Wednesday to return to the AFL.

The boom Saints forward, who re-injured his shoulder against the Western Bulldogs a fortnight ago, successfully completed a skills session on Tuesday and if ruled fit will play Friday against Collingwood at Telstra Dome.

"It's not a risk if he trains and he's okay and they declare him fit to play - I can't see where the risk is (of playing him Friday," assistant coach Matt Rendell said on the club's website.

"If there's any question mark he won't play - we've just got to wait and see how it is tomorrow. If it's not 100 per cent then he won't play."

Club doctors will assess Riewoldt's recovery on Wednesday.

It was initially thought Riewoldt would miss at least two months after he injured his right collarbone for the second time this season, against the Bulldogs.

The first injury, suffered against Brisbane in round one, had the skipper out of action for six weeks.

It was feared he had re-fractured the collarbone in round 14 against the Dogs, but further tests have revealed only a medium-grade AC joint strain.

"If there was a crack I'm pretty sure he'd still be unable to lift his arm up," Rendell said.

"That's why they think it's an AC joint and not a crack in there again.

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