St Kilda forward Jack Lonie has avoided an ACL injury despite landing awkwardly in a marking contest during his side's loss to Adelaide on Saturday night.

It appeared that the 22-year old could've been in some strife after suffering a gruesome hyperextension of his leg in the incident.

However, Saints coach Alan Richardson said that scans revealed he had only suffered ligament damage.

"It looks like he's escaped ACL injury, which is brilliant," Richardson told SEN.

"He still will miss a bit of footy."

Further assessment will determine a time frame on when Lonie will return.

Furthermore, skipper Jarryn Geary left hospital on Sunday after undergoing surgery on his thigh.

“It’s great for Jarryn and his family to be home and so far the wound his healing as expected," Saints GM Simon Lethlean told the club website.

“How long he’ll be unavailable for will depend now on how the wound heals over the next two weeks and how quickly he can return to training.”