Since he arrived from Cambridge United in 2021, Mullin has been at the heart of Wrexham’s meteoric rise from non-league football to the Championship, helping them secure three consecutive promotions. His tireless work ethic and eye for goal made him a fan favourite and earned him numerous personal accolades.
However, Parkinson acknowledged that moving up the divisions quickly, paired with an injury-hit preparation, was always going to make the transition to Championship football difficult.
"Mullin had a chat with (Wigan boss) Ryan Lowe and he decided he wanted to go somewhere where he knew he was going to play after a year of not playing as much as he wanted, but there were reasons for that," he said.
"When you step-up divisions quickly, and he had that disrupted build-up to last season, it was always going to hinder him a little bit. He has had a good off-season, and now he can have a good pre-season with Wigan. They have got a great signing and Mulls can get himself going again, so it is a good move for him."