GLASGOW - Celtic will have to put their European disappointment behind them as they get back to Scottish Premiership action against St Johnstone at Parkhead on Saturday.
The Hoops suffered heartache in the San Siro on Wednesday after they succumbed to two late goals to lose their opening Champions League fixture against AC Milan, 2-0.
The Scottish champions earned plaudits from their performance but were left frustrated when Emilio Izaguirre deflected Cristian Zapata's 82nd-minute shot into his own net before Sulley Muntari added a second soon afterwards.
Neil Lennon's side will get the chance to take their European frustrations out on St Johnstone when they visit Parkhead but the Celtic manager will be wary of the poor form his side showed immediately before and after European matches last season.
In last season's Champions League the Hoops were beaten twice in the competition - by Barcelona and Benfica - and on both occasions lost at home on domestic league duty days later.
However, defender Charlie Mulgrew said manager Lennon had instilled a belief in his players that made them positive about what they can achieve this season.
"I thought we played well and maybe just couldn't take our chances," the Scotland international said.
"We never deserved a 2-0, but we know that's what AC Milan can do.
"It felt quite comfortable and maybe, if we had taken one of our chances, it would have been a different result.
"But that's the Champions League for you and we have to pick ourselves up.