Neil Lennon gave a scathing assessment of Celtic after the 3-2 upset defeat by St Mirren in the Scottish Communities League Cup semi-final at Hampden.
Esmael Goncalves' early opener for St Mirren was cancelled out by Gary Hooper, but the Buddies made the most of Charlie Mulgrew's missed penalty as Paul McGowan scored from the spot before Steven Thompson added a third.
Mulgrew's late strike was a mere consolation for Celtic and an angry Lennon felt his side did not display enough desire or discipline.
"There was a lack of intensity to our play in the first half, a lack of hunger, a lack of will to win," he said. "I don't know where that performance came from.
"The second half we looked much, much better. The turning point was the penalties. I didn't think either of them were, but they took theirs and we didn't and that changed the game.
"Our attitude's been very, very good this season but I didn't like the attitude today and I've made that clear to them. There was a lack of discipline, lack of shape - we didn't play like a team today; we played like individuals.
"I'm not going to hide away from criticism - me first and then the team - we're open to that. There was certainly no complacency in our preparations, but the lack of intensity really concerned me today."