Angry Brendan Rodgers blasted Celtic for their "passive" second half showing against Dundee.
The Dens Park hosts came from behind twice and showed real determination to cause Celtic more bother once making it 2-2 just nine minutes into the second half.
Dundee's Aaron Donnelly appeared to have won the game on 78 minutes, but there was to be more late drama as Celtic were awarded a late penalty in injury time following Mo Sylla's handball, and Arne Engels made no mistake from the spot.
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"It was disappointing really in terms of the end result," Rodgers told Sky Sports despite the draw extending their lead at the top of the Scottish Premiership to 16 points.
"I thought the first 40 minutes we were really comfortable in the game. We got off to a great start, we start how you'd want to.
"Sometimes the problem is when you have so much of the ball, you can become a little bit passive with and without it. We concede just before half time and then in the second half I thought we were really disappointing.
"I mean you can give credit to Dundee, they get the goal just before half time and then it gives them a little spark for the second half. But for us, our level was not good enough second half and we have to be much, much better for that.
"We were passive, we lacked aggression, both against the ball, duels, in our passing, it was sidewards and backwards in possession, our positioning.
"Listen, we have kept fighting right until the very end and we get the point, but we let a game get away from us that we had so much control over for 40 minutes.
"Give credit to Dundee because they fought themselves back into it, but when I look at us, we've got to be much better than that."
