Brendan Rodgers described Celtic’s loss to Lazio as “devastating” with their Champions League campaign faltering again in Glasgow.
Pedro’s 95th-minute header yanked a point away from the hosts, who just minutes earlier thought they had clinched a winner themselves through Luis Palma only for VAR to intervene.
Instead Celtic remain bottom of Group E on zero points.
“We’re bitterly disappointed,” said the Celtic manager.
“To concede late on like we did, it’s really harsh on us. But, there is learning there, you have to secure the ball in the game and if you’re not going to win it at that stage, you certainly can’t lose it.
“The players gave everything, we have the mentality, everything. I’m just disappointed for the players and supporters that we couldn’t get the result.
“It was a devastating way to lose a game because we deserved something from it, but we’ll analyse it and learn the lessons from it.”
Kyogo Furuhashi battered the ball beyond Ivan Provedel to open the scoring, only for Matias Vecino to level before half-time.
Celtic edged a cagey second half before a drama-filled final 10 minutes, with a prolonged offside call and a last-gasp Lazio winner compounding Rodgers’ anguish.
The Northern Irishman’s side now head into a crucial double header with Atletico Madrid, who beat Celtic’s conquerors from match day one, Feyenoord, 3-2 in Spain.
“We were under no illusions at the beginning of the competition where we sat,” he said. “I said at the beginning our idea was to qualify for European football, and that’s still the ambition and mentality.
“We have shown over the two games against good sides that we can compete. If we can just tidy up one or two moments and maybe get a bit of luck, we will still fight in every single game to get that qualification.”