Richmond has lost Chris Knights and Shane Tuck to injury Chris Knights is stretchered from the field. He's been ruled out for the season. RICHMOND has suffered a double injury blow with Chris Knights and Shane Tuck ruled out long term and Trent Cotchin no certainty to return next week. Knights will miss the remainder of the season after undergoing knee surgery today to fix a patella tendon injury, while Tuck has been ruled out for 6-8 weeks with a fractured scapula. Knights bizarrely injured his right knee in yesterday's win against Port Adelaide. After booting a goal the former Crow slipped and landed awkwardly before being stretchered from the field. "It's really disappointing for Chris," Tigers football manager Dan Richardson said. Richmond forward Jack Riewoldt reacts to Chris Knights' injury. He's been a great addition to the team since arriving at the club late last year, and he'll be missed on the field. Tuck, 31, will also require surgery. The tough midfielder broke down in the third quarter but played bravely played out the win. Richardson said the Tigers expect him to return and have a big impact in the second half of the year. Richmond is set to welcome back Ty Vickery for next week's clash with embattled Melbourne, but Cotchin, Dylan Grimes and Ricky Petterd must prove their fitness this week. Cotchin missed the win against Port Adelaide with a knee complaint. Richmond had enjoyed a golden run with injury until last week, with only Reece Conca (foot) absent from its best side. Knights enjoyed a breakout match against Fremantle three weeks ago. The rejuvenated half-forward enteried the Port Adelaide clash averaging 19 disposals and had booted five goals. Fremantle ruckman Jon Griffin will also miss the rest of the season after rupturing his ACL against Collingwood last night. See the incident HERE