ROOKIE Hawthorn defender Tim Mohr is set to miss the remainder of the season after surgery to repair a complicated knee injury on Tuesday.

Mohr suffered a dislocated knee in Sunday's VFL practice match for Box Hill on Sunday before scans revealed he had torn both his ACL and PCL.

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The 30-year-old former Giant, who this year arrived at Waverley Park via the NAB AFL Rookie Draft, was operated on by renowned surgeon Julian Feller.  

The injury took place in the opening minutes of the clash against Casey Demons on Sunday, forcing a halt in play for 45 minutes as the ambulance arrived.  

Mohr previously suffered back-to-back ACL injuries to his left knee in 2014 and 2015 while playing for Greater Western Sydney.

In seven seasons from 2012 to 2018, Mohr played 48 matches for the Giants, including two last season.  

With Mohr to be placed on the long-term injury list, the Hawks will have the ability to replace him via the mid-season draft to be held after round 10.

The Hawks have already used the new player movement rules by adding beanpole ruckman Ned Reeves in place of the retired Will Langford in the supplemental selection period.