When will prolific Paul Mullin be back to his best for Wrexham after punctured lung? Phil Parkinson answers ‘difficult question’Chris BurtonGettyWrexhamP. MullinUnited StatesWrexham vs Doncaster RoversLeague TwoP. ParkinsonPaul Mullin has returned to action with Wrexham after suffering a punctured lung, but Phil Parkinson is unsure as to when he will be back to his best.Article continues belowArticle continues belowArticle continues belowArticle continues belowStriker injured during pre-seasonReturned to action in League TwoDragons need his goal threat