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Glasgow Warriors beat Bath 26-21 in their Round 1 home match and captain Alastair Kellock knows that nothing less than more home success will do at this crucial stage of the tournament.
"These are big games, like one-off Test matches," said the international lock.
"The next two rounds of games really determine whether you are still in the mix of the Heineken Cup after Christmas.
"It's all about winning and not really about performance from here in. Every side wants to make sure they still have something to play for after the next two games.
"We were happy with the win against Bath but weren't happy with our performance, while we were really disappointed with our performance against Leinster.
"They are the reigning champions and deserved the win and we were well beaten but I don't think either side played to their real potential.
"We have talked at length about the Leinster game and we all know a performance like that against Montpellier will not be acceptable.
"We have to perform better in our next two games home and away against Montpellier - it is as simple as that.
Glasgow are bidding to reach the full knock-out stages for the first time in 13 attempts, although they did contest the quarter-final play-offs that were part of the competition in season 1997/1998, going down 90-19 to Leicester and missing out on a place in the last eight.
In addition to Toulouse, who they beat 33-26 at Stade Ernest Wallon in the 2008/2009 tournament, Glasgow Warriors have also enjoyed wins over Colomiers, Bourgoin and Biarritz Olympique.
"Montpellier are a very physical side and they will be disappointed at only having a draw to show for their efforts so far - they will probably feel they should have got more from their previous games," said Kellock.
"Like most French teams they have three big ball carriers to make the hard yards and then they let their backs take over from there.
"We are under no illusions of the task facing us and what they will bring to the game. We do have a pretty good record against French sides but that doesn't really count for much for this game.
"Experience in the Heineken Cup is a huge factor in games like this, we have a lot of players who have played for a while in this tournament but haven't played in really big Heineken Cup games like these next two.
"Montpellier don't have much experience of this competition but they do make up for that with big-game players who have played in big international rugby games. These games mean you have to lay it on the line the 80 minutes."
