I have no problem with some polite applause prior to kick off. Then it’s us against them as normal. Certainly wouldn’t be booing him just because he’s an ex player in a Celtic jersey. However, if he does something “boo worthy”. Then by all means boo him, same as you would any other player. I wish him all the best and a great career (perhaps returning to us like uncle Phil) but hope he stinks against us. COYW