Celtic came from behind to beat HJK Helsinki 2-1 in the first leg of their Champions League third qualifier at Parkhead, but the goal conceded leaves Neil Lennon's men with plenty to do next week in Finland.
The Hoops were made to pay for early profligacy less than two minutes into the second half when Rasmus Schuller fired the visitors ahead.
Parkhead striker Gary Hooper levelled in the 54th minute, before defender Charlie Mulgrew headed the winner seven minutes later.
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