Celtic started their UEFA Champions League Group E campaign with a 2-0 defeat to Feyenoord.
Calvin Stengs opened the scoring for the hosts on the stroke of half time as his free kick found the net.
Brendan Rodgers' side were reduced to nine men in the space of five second-half minutes as Gustaf Lagerbielke and then Odin Holm were shown red cards.
Joe Hart saved a penalty from Igor Paixao but the home side doubled their lead through Iranian attacker Alireza Jahanbakhsh.
In Group E's other encounter, Lazio drew 1-1 with Atletico Madrid.
