The coach is yet to pick up his first win since replacing Claudio Ranieri over the summer and oversaw a heavy defeat on Sunday
Jardim replaced Claudio Ranieri at the helm over the summer but continues to seek his first competitive point, having watched his side lose 2-1 at home to Lorient last weekend.
In this encounter Monaco took the lead through Dimitar Berbatov but then crumbled as goals from Diego Rolan (2), Emiliano Sala and Wahbi Khazri completed a stunning turn around.
Two of those four goals came from the penalty spot and Jardim said the decision of referee Tony Chapron to award the spot-kicks cost his side the game.
"We had a game with two very different halves, a good half of Monaco where we were very well organised and a second half in which the adversary has come back and equalised quickly," he said.
"Then we had two refereeing errors that sealed the match and after that there's been no game. We must continue to work - we will continue to believe in these players.
"I have certainty that their game will get better and also certainty that there will be more mistakes. The French referees are good but there will be more mistakes in the future."
Monaco finished second in Ligue 1 last season but the result leaves them second from bottom of the division after two games.