The Welsh side, bankrolled by Ryan Reynolds and Rob McElhenney, have been promoted to League One and are now targeting their third successive promotion, this time to the Championship. Mullin scored 26 goals in all competitions last season.
WHAT PARKINSON SAID
Parkinson said, per Leader Live: "Mulls is going to be close to maybe missing a couple of games at the start of the season if everything goes well but no more than that.
"It is a blow but he is a fit lad and doesn't take long to get back. He will have his own mini pre-season and we will get him back as fit as we can."
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WHAT NEXT FOR WREXHAM?
Wrexham will open the new campaign against Wycombe Wanderers on August 10, following their pre-season preparations. They face four League One games in August, as well as an EFL Cup tie against Sheffield United.