But fellow flag stars David Astbury (achilles) and Tom Lynch (knee) are still at least another week away, while out-of-form small forward Daniel Rioli has been dropped from the team that lost to West Coast in Perth before the bye.

Ryan, a 207cm prospect, will line up alongside fellow inexperienced talls Mabior Chol and Callum Coleman-Jones in what coach Damien Hardwick sees as a glimpse of the Tigers' future.

A 20-year-old Queenslander, Ryan was Richmond's first pick (No.40 overall) at last year's national draft.

"We thought he was a project player but his ability and drive to learn has been really important," Hardwick said.

"His game at VFL level last weekend was very, very good.

"He's tough in the contest for a guy of his size, he uses the ball at ground level very well, so we're really excited about what he's going to bring."

Hardwick acknowledged St Kilda present a different challenge with Rowan Marshall back from injury this week to rekindle his ruck partnership with veteran Paddy Ryder against Chol and Ryan.

Both Saints ruckmen were unavailable when Richmond smashed Brett Ratten's side by 86 points in round five.

St Kilda lost a semi-final to the Tigers last season and have come under fire after slipping out of finals contention this year with four losses in their last five outings.

"They've been bashed around a little bit in the media but we know they, at their best, can be very damaging," Hardwick said.

"We've got to be aware of how that looks.

"They've changed the way they play a little bit from last time we met them; they move the ball a little bit more round-the-world type of movement.

"But we know they're a dangerous side when they're firing on all cylinders."

A crowd of up to 25,000 will be allowed at the MCG after the Victorian government eased COVID-19 restrcitions.

It will be the first crowd at a sporting event in Melbourne since May 23.

Australian Associated Press