Pretty sure Marchisio will help cover the left side, plus I expect a defensive performance from Peluso. I don't think we're gonna be exposed there eventhough it is our weakest point tonight.
We (Celtic) play more of a 4-4-1-1 than a 442 when we use it (which is in tough European games). We do use 3412 but only against weaker sides... can't imagine it will make an appearance in this tie. Commons will probably be between the midfield and Hooper. Bit of a pity Sammy isn't starting.