Chelsea manager Frank Lampard has termed the club's 3-0 Champions League loss to Bayern Munich on Tuesday night a harsh lesson.
The Blues held the Germans in the first half with clever player and resolute defending but collapsed in the second half as the visitors scored three unanswered goals.
Former Arsenal Serge Gnabry grabbed a brace before dangerman Robert Lewandowski scored a third to potentially take the tie away from Lampard's boys.
The Englishman was disappointed that his side could not play with the same intensity as the visitors but admitted they (Bayern) were the better side.
"That’s football at this level," the manager said.
"Bayern Munich’s levels were fantastic. Unless we were to get everything right it was going to be a tough night. We didn’t get everything bang on, we weren’t confident on the ball. That was my biggest disappointment, mostly from start to finish.
"We want to play here, we’ve shown that all season, but today we went away from that. That can happen in an intense atmosphere when all eyes are on. It was a harsh lesson and a reality for the players of the levels we want to get to," he added.
Lampard was however positive ahead of the second leg at the Allianz Arena, even though he knows it will be an almost impossible task.