Celtic midfielder Stilian Petrov was struck by a missile thrown from the crowd as he celebrated his 21st-minute opener against Rangers at Ibrox.`
The Bulgaria international headed home a Didier Agathe cross to give the Hoops the lead in the crucial Bank of Scotland Premier League Old Firm clash.
But, as he celebrated in front of Rangers supporters, a missile struck him on the head and he left the field to receive treatment.