Cal Gilkison
BBC Sport Scotland
Oh Hyeon-gyu isn't the only familiar face Celtic will come up against.
Besiktas' visit also marks the return of former Rangers players Ridvan Yilmaz and Vaclav Cerny.
While ex-Celtic striker Oh is set for a warm welcome from the Parkhead crowd, Yilmaz and Cerny can expect anything but.
Cerny in particular could well face the ire of the home support, as the last time the Czech Republic winger played at Celtic Park he skooshed water at Celtic fans while celebrating Hamza Igamane's late winner in a 3-2 Rangers victory in March last year.
