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Scott Brown has admitted responsibility for the red card which helped Barcelona win at Celtic Park on Tuesday.
Kris Commons admits Celtic face a tough task if they are to reach the last 16 of the Champions League.
Cesc Fabregas' late goal earned Barcelona a hard-fought 1-0 UEFA Champions League win over 10-man Celtic at Celtic Park.
Celtic manager Neil Lennon felt Scott Brown was unlucky to be sent off following his side's 1-0 defeat to Barcelona.