Sebastien Roudet has warned Sochaux they cannot turn up at Stade de la Route and expect to turn Rennes over in the same way they did against Paris St Germain last weekend.
Sochaux have spent most of the season battling against relegation from Ligue 1, but last week they registered a shock 3-2 win over leaders PSG.
The win, which came courtesy of a late goal from Cedric Bakumbu, boosted the squad's morale, but given they sit three points above the relegation zone, Roudet knows his men cannot afford to rest on their laurels.
``We have the right to enjoy the win over PSG because we haven't won many games this year,'' Roudet told Sochaux's official website.
``But we must keep our feet on the ground. The PSG win is just three points gained. We did not win the World Cup final.
``It's good that we were successful, but we must be careful.
``We cannot think a good performance against PSG will automatically mean we get a result in Rennes.
``We must try to become more consistent.''
A look at Rennes' record this season shows why Roudet sounded a warning to his side over any potential complacency.
Frederic Antonetti's men themselves beat PSG at the Parc des Princes back in November.
That was the club's only victory against any member of the top four, however. Rennes have based their climb to sixth in the table - where they finished last year - on beating teams from the lower reaches of the division like Sochaux.
Rennes sit just six points off Champions League qualification despite a 2-0 defeat to Lille last week.
Antonetti admitted his team looked ``average'' without striker Romain Alessandrini, who suffered a long-term knee injury during the game.
Defender Kevin Theophile-Catherine thinks the team will be able to cope without the 23-year-old French striker, however.
``We are sad about losing Alessandrini, it is a big blow,'' Theophile-Catherine said.
``This can happen in football. He brought a lot to the team over the last six months. On the pitch he had the spontaneity, it was beautiful to watch and he was decisive.
``We will try to do without him. Other players bring other qualities. We can count on Abdoulaye Sane and others.''