Second-placed OM, who take on second-from-bottom Stade Brest on Saturday, have not conceded a goal in their last five Ligue 1 outings, thanks to sterling performances by centre-backs Lucas Mendes and Nicolas N'Koulou, while keeper Steve Mandanda produced a world-class performance in the 0-0 draw at Lille last Sunday.
The club have Andre-Pierre Gignac to thank for the goals that gave them their last two wins but have gained little from the presence of Andre Ayew in the starting line-up, with the Ghana striker unable to score in 10 weeks.
"There is a collective momentum, a desire not to concede a goal, to stick together," coach Elie Baup told the club's website.
"It shows that we are not ready to let our place on the podium slip. We are going to continue like this."
"It is a big blow for him and for us because we need everyone," said coach Claude Puel, who will also be without suspended striker Eric Bautheac.
"We need to confirm this against Montpellier. The Toulouse win gave us something to cheer about after a very difficult period," Argentine striker Lisandro Lopez, who has had a below-par season, told reporters.
