Manager Carlo Ancelotti will be hoping to get back on the title track when his Paris St Germain side take on Marseille in the Clasico at the Parc des Princes on Sunday.
Ancelotti's team slimped to a surprise 2-1 defeat at Nancy last weekend and have not won in their last three league matches.
The PSG boss has tinkered with formations since taking over three months ago and his team have gone from being three points clear in December and on course for their first French League title to second, level on points with leaders Montpellier who have a game in hand.
It makes Sunday's match a must-win game against a Marseille team who beat PSG 3-0 in the league in November but who were dumped out of the Champions League by Bayern Munich in midweek.
Marseille, who have drawn one and lost nine of their last 10 matches in all competitions, have slipped to ninth in the Ligue 1 table, 20 points behind the leaders,
But PSG's Serbian defender Milan Bisevac, who is looking forward to his first home Clasico, said: "Even though they are struggling a little, anything can happen in this type of match. In El Clasico you have to give the absolute maximum to win. That's what we'll be trying to do.
"It is the most important match of the year for the supporters and very, very important for us too. We need to win this weekend to launch us back on the winning track for the final seven games of the season and the race for the title."