That would be my fear with him too. Was mostly [Poor language removed] last season but good in the champions league when the world was watching....Mahrez seems moody and whilst that is ok when you're picking him up for a bargain it's not something you want to be paying big bucks for. I think he was left out at times by Leicester last season when they needed points. Sigurdsson is different gravy and I wouldn't compare them given the positions they play.
But if we were doing well could it be argued he would rise to the challenge.