The 27-year-old left Rangers to join John Toshack-managed Iranian side Tractor Sazi this week.
Signed by former Gers boss Mark Warburton in 2016, the English attacker hadn't kicked a ball for the Ibrox side since March 2017, after spending last season on loan with AFC Wimbledon.
Forrester made headlines in August 2016 after two reckless challenges during a 2-1 win at Dundee, with Sutton branding referee Craig Thomson a "total bottler" for failing to send him off.
Asked on BT Sports if he was sad to see Forrester leave, Sutton said: "Yeah I am sad. I like Harry. He's a talented boy and I wish him well."
Asked about his prior comments, Sutton added: "There were a couple of dodgy tackles. I don't blame Harry Forrester - it was Craig Thomson."
The writing had been on the wall for Forrester for some time. Jamie Murphy's arrival on a permanent basis this summer, coupled with the promise that Glenn Middleton has shown, was effectively another nail in his coffin at Ibrox.
Forrester did his bit in helping the Gers win Scottish Premiership promotion in 2016, scoring four goals in 11 Championship outings since joining from Doncaster in the January transfer window.
But the step up in class proved too much for him, having only managed three Premiership goals in 21 outings under Warburton and later Pedro Caixinha during the 2016-17 campaign.
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