Scott Brown has admitted responsibility for the red card which helped Barcelona win at Celtic Park on Tuesday.
Barcelona boss Tata Martino refused to give his opinion on Scott Brown's sending off in the win over Celtic.
Celtic manager Neil Lennon felt Scott Brown was unlucky to be sent off following his side's 1-0 defeat to Barcelona.
Cesc Fabregas' late goal earned Barcelona a hard-fought 1-0 UEFA Champions League win over 10-man Celtic at Celtic Park.
Cesc Fabregas has urged his Barcelona team-mates to step up when they take on Celtic without Lionel Messi.
Celtic boss Neil Lennon believes the absence of Barcelona striker Lionel Messi is a boost for his side.
Celtic must be more prudent in possession if they are to challenge Barcelona, John Collins told Sky Sports.