Arsenal legend Martin Keown has warned Celtic against "pretending" they can match the elite clubs in the Champions League after they were demolished by Dortmund.
It was a horror night for the Scottish Premiership champions in Europe's elite competition as the Bundesliga heavyweights smashed seven goals past Kasper Schmeichel - and it could have been more had Nuri Sahin's side been more ruthless in front of the Westfalenstadion cauldron.
Celtic crumbled in front of the Yellow Wall to leave Brendan Rodgers fronting up to another massive defeat in Europe - having previously overseen drubbings at the hands of Barcelona, PSG and Atletico Madrid.
And Keown was far from impressed with the Hoops' collapse in Germany - as he dished out the blame to Rodgers, the Celtic players and the clubs they face on a weekly basis domestically.