Neil Warnock’s men come to Trentside for a televised clash on Saturday evening (kick-off 5.30pm) and Montanier admits his side have to produce a performance following the disappointing defeat at Blackburn in midweek.
He said: "Our job is to train well and get prepared for Saturday’s game against Cardiff. Any off-the-field events don’t have an effect on us as players and staff because we have to concentrate on picking up results.
"We’re only focused on getting a result this weekend and repeating the performance we put in against Birmingham. The players set the standard that night but now we have to find some consistency because Tuesday night wasn’t good enough.
"We saw against Blackburn that if you lose concentration then you’ll lose the game and that is what happened. The game has taught us a lot and the players are determined now to get back out there and put things right.”
The Bluebirds have picked up four points from two matches under Warnock’s management and the Forest head coach believes Saturday’s visitors have the ability to cause his side problems when they arrive on Trentside.
He said: "Cardiff’s league position is not a true one. They are a good side and we’re not judging them on where they currently are in the league table. We know that they have some momentum from their new manager and it will be a difficult game.
“I had a good experience in the Directors’ Box against Birmingham because it gave me a great view but I am looking forward to getting back on the touchline. You need to be close to the players in order to help them on the pitch.
“We hope to have some players back from injury on Saturday including Vaughan, Carayol, Fox and Mancienne but it will be touch and go. Britt Assombalonga looked good when he came on at Blackburn and we want to give him some more game time as well."