"We had lots of chances to score the second goal," the Monaco boss told reporters. "Football is like that. When you don't score the second, the opposition counter-attack and score.
"It is not the first time that the team has created lots of chances, but we are not clinical enough. We have lots of chances in every match.
"It is two points lost, but the team must continue. I think that one day we will score two goals from three chances. But to do that, the youngsters need a bit more experience and a bit more maturity in front of goal."
Monaco are unbeaten in their last six games in all competitions and have climbed to seventh in the Ligue 1 table.