Brendan Rodgers has admitted a costly defensive error handed Bayern Munich victory in Glasgow.
The Celtic boss was left frustrated by the nature of the second goal for the Bundesliga giants in the Champions League contest.
Michael Olise had opened the scoring before the break with a thunderous effort. Harry Kane then doubled the lead as he was left unmarked in the box and knocked home.
Rodgers was left frustrated by the second goal in particular and made it clear to the players at full-time as he insisted the lethal marksman is the one player he didn't want free in the box.
Daizen Maeda did pull one goal back for Celtic to keep the knockout play-off round tie alive.
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Rodgers was far happier with the second half from his team with everything to play for in the return leg in Munich on Tuesday.
"We're disappointed with the second goal," Rodgers told Celtic club media.
"I have just said to the players in there afterwards, if there is one player that you don't leave unmarked in the box it's probably the world's best striker.
"And that's what happened, he gets his finish.
"In saying that, from that the reaction was great.
"We started to get in contention, we shifted the game to get more pressure in the top end of the field and in the last 20-25 minutes we looked a real threat in the game.
"Not so good first half in terms of being passive, second half was a bit better."
