AEK Athens grabbed a crucial away goal as they held Celtic to a draw in a Champions League qualifier in Glasgow.
Celtic are in danger of missing out on the Champions League group stage after a 1-1 first-leg draw at home to a 10-man AEK Athens left their third qualifying round tie finely poised.
Comfortable winners over Alashkert and Rosenberg, Celtic found it far tougher against the Greek champions and must now secure an away result if they are to reach the play-off round.
Brendan Rodgers' men had appeared likely to take a lead to Athens when Callum McGregor broke the deadlock inside 20 minutes, only for his opener to be cancelled out by a rasping Viktor Klonaridis strike in the 44th minute.