Martin O’Neill has admitted Celtic’s Champions League qualifying collapse from 4-0 up ranks as one of his most painful nights as the club’s manager.
Celtic held a four-goal aggregate lead against Lask on Tuesday when Callum McGregor scored in the 21st minute in Austria, building on a 3-0 first-leg victory, and appeared to be cruising into the league stage. But they lost 5-1 on the night, after extra time, to exit in extraordinary fashion.
