Richmond youngster Judson Clarke has suffered a third anterior cruciate ligament (ACL) injury after recently returning from a long stint on the sidelines.

Clarke, who was in his sixth game back from his previous ACL injury, had been in strong form in the VFL. But following an incident in the reserves' win over Sydney, scans revealed the devastating news.

Richmond GM of Football Performance Tim Livingstone said the setback was "unfortunate" for the 21-year-old.

"Judson is a great character and has worked so hard behind the scenes to get himself back playing football and into fantastic form," Livingstone said.

"This is such an unfortunate setback for Judson, and we are all so disappointed that he will not be on the field for a little while.

"He will have the support of everyone at Richmond to come back again from this, and we know he will give it his all."

Clarke had recently signed a contract extension, locking him away until the end of 2026.

Emerging defender Campbell Gray also suffered a knee injury in the VFL on Saturday, with the Tigers confirming the "posterolateral knee injury that does not require surgery. He is expected to miss some football, with a timeline for his injury to be clearer in the coming days".

Livingstone said Gray would consult the club's medical team before a timeline could be made on his return.

โ€œCampbell will still require a period of rehabilitation, but we hope to see him back continuing his good form sooner rather than later," Livingstone said.