SPEEDY St Kilda forward Dean Kent is out for the season after suffering a quad injury at training on Thursday.

During match simulation at RSEA Park, Kent kicked the football after a mark and then went down to the ground in pain.

Kent could require surgery on his left quad as he faces up to three months in rehab.

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

"Scans show Dean has acquired a tear to the top of his left quadriceps muscle," football manager Simon Lethlean said.

"Unfortunately, with injuries of this nature you're looking at a 10 to 12-week recovery period, so this will end Dean's season.

"It's really disappointing for Dean and the club, but we just have to ensure he has the best treatment and we support him and his young family as well as we can."

It marks yet another blow for the club, which has endured a wretched run with injuries this year.

Gun midfielder Jack Steele suffered a dislocated kneecap at training a fortnight ago, joining Jack Steven (mental health) and Dylan Roberton (heart) among those on the sidelines.

Saints coach Alan Richardson is fighting for his job after a rough month that has seen the side thumped by Port Adelaide and Brisbane to be sitting 6-7.

Steven was among those taking part in match simulation at training as he eyes off a return in the coming weeks.

Steele and dynamic forward Jack Lonie (right knee) also did everything, as they look to be back playing within the next fortnight.

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However, defender Jimmy Webster was on limited duties as he nurses a right hand issue that has kept him out since round eight.

Wingman Ed Phillips joined Webster in doing rehab work as he recovers from a hamstring complaint.

Ruckman Lewis Pierce was in match simulation, but sported a fluoro cap to signify he wouldn't take part in contact work as he deals with a long-term concussion.

Fellow big man Billy Longer is dealing with the same problem and didn't take to the track either.

St Kilda was decimated by the Lions last week and forward Tim Membrey said that had been addressed.

"We've had some pointed conversations throughout the week," Membrey said. 

"Our performance on the weekend was nowhere near up to the standard that we hold ourselves to. We've had some good conversations throughout the week so hopefully this weekend we can come out and turn that around."

Club great Nick Riewoldt was on hand to promote the clash at Marvel Stadium, which marks Maddie's Match, held to raise awareness and funds to find a cure for bone marrow failure patients.

For him, it's about more than having lost his younger sister Maddie to the disease in 2015.

"We're probably in a position now it's clearly gone past just being about us, it's about all the other people that are suffering and have suffered. We do it so well as an AFL community," Riewoldt said.

"I was fortunate enough to be part of the Big Freeze only a few weeks ago. These are the occasions that we just do so well as an industry."