As far as I know he has never played left side centre or full back.
Could be wrong of course but very risky except in an emergency.
Don't think we're there yet
If Crofts was fit I would sacrifice a winger (Murphy) to give us a more combative midfield.
I could make a case for JFC on the same basis (he was on top form on loan at MKD after all).
The alternative of using VLP's pace to stop their fullback getting forward is a good option.
Just depends how...