Celtic midfielder Charlie Mulgrew is not satisfied with glorious failure in the Champions League as he maintained his team has the belief to qualify for the last 16 following their opening loss to AC Milan.
Celtic looked on course to take at least a point at San Siro before two late goals consigned them to a 2-0 defeat in their first match in Group H.
Although goalkeeper Fraser Forster was called into action four or five times, the Scottish champions might have nicked the goal their possession arguably deserved.
Striker Anthony Stokes had a shot blocked in the first half before his second-half free-kick from 25 yards clipped the crossbar before going over.
Georgios Samaras drove wide from distance just after the break while skipper Scott Brown hesitated enough when he was sent through by Kris Commons to allow Milan midfielder Nigel De Jong to make a crucial saving tackle.
Celtic still looked as though they would leave Italy with a point until defender Cristian Zapata's drive in the 82nd minute deflected off Parkhead left-back Emilio Izaguirre and ended up behind Forster.
The Englishman was beaten again four minutes later despite making a great save from Mario Balotelli's free-kick, as midfielder Sulley Muntari knocked in the rebound.
And Mulgrew could not hide his disappointment afterwards despite the encouraging performance.
"We're here to compete in this group, not just put in good performances and get beaten and come away happy," Mulgrew told BBC Scotland.
"It's just a massive disappointment. I thought we played well and maybe just couldn't take our chances.