A CAGEY Michael Voss has attempted to defuse any concern over Charlie Curnow's fitness after the star Carlton forward was involved in a heavy training collision.

The Blues coach has declared the dual Coleman medallist available for Friday night's clash with St Kilda at the MCG.

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Curnow will take part in Carlton's captain's run on Thursday in a bid to reassure medical staff he is fine to play.

Voss confirmed Curnow had collided with star ruckman Tom De Koning at training, but disputed reports the 28-year-old had an issue with his knee.

With Carlton coming off a thumping defeat to Adelaide, Voss was in no mood to discuss specifics around Curnow's health.

"He'll be fine," Voss said on Thursday.

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"The last 30 seconds of the drill, him and Tom had a nice little collision, so it's not exactly what you want to see.

"I tried to have a bit of a laugh to fob it off, but holding his knee is incorrect."

Voss also rejected suggestions Curnow had been receiving pain-killing injections in his knee to train and play.

"You don't need to know specifics, let's just say he's playing," Voss said.

Voss also said key defender Jack Silvagni would return after missing the 60-point smashing by the Crows at Adelaide Oval.

Silvagni, who has been one of the Blues' best players this season, broke his hand in the rousing win against Geelong a week earlier.

At 3-5, Carlton needs a response against the Saints after they regressed badly against the Crows.

After dropping their first four games, the Blues looked back to their best form that took them to the finals in the past two seasons.

"That's probably why it makes it a little bit disappointing because we've made a lot of ground in a lot of areas and we weren't able to get that done on the weekend," Voss said of the performance against the Crows.

St Kilda is 4-4, after putting a disappointing three-week patch behind them to thump Fremantle in ruthless fashion last Friday night.

"We know they (St Kilda) set up really strong defensively behind the ball ... we expect there'll be a lot of numbers around the ball, and it will obviously be hard to score," Voss said.

"We just have to be able to be patient and wait for our opportunities."