Borussia Monchengladbach revived their hopes of progression from Champions League Group C with a deserved 2-0 win over Celtic in Glasgow on a night to forget for defender Kolo Toure.
Gladbach were the stronger team in a goalless first half and took the lead shortly before the hour mark when captain Lars Stindl struck after a defensive error from Toure.
With Barcelona cruising to victory over Manchester City in the group's other game, Gladbach's win - their first in the European Cup since 1977 - puts them up to third place, just one point behind Pep Guardiola's side at the halfway stage.
Gladbach were the first to threaten, with Ibrahima Traore's strike after a cut-back from Oscar Wendt brilliantly saved by Craig Gordon, who then reacted quickly to prevent Hahn from converting the rebound.
Celtic were struggling to assert themselves on the match, but wasted a good opportunity just before the break when Tom Rogic's precise throughball led to Scott Sinclair lashing a rushed finish over the bar.
The visitors got their deserved breakthrough on 57 minutes and it was Stindl's pass that started the attack.
Brendan Rodgers brought on Leigh Griffiths and Patrick Roberts in the closing stages, but despite the on-loan City winger's lively cameo, the hosts barely troubled Yann Sommer and it was game over with 13 minutes remaining.
