Interim manager Guus Hiddink says Chelsea have a 50-50 chance of making it through to the next round of the Champions League.
The Blues produced one of their best performances of the season in Europe but it wasn't enough as they were beaten by 2-1 at the Parc des Princes.
They will host Laurent Blanc's men at Stamford Bridge on March 9.
"I think it's still 50-50," Hiddink said.
"Of course a defeat is never a good or a nice feeling but you have to consider it's a two-legged game.
"Scoring away is always good and we emphasise that. We had good, tactical defensive organisation. On top of that we were dangerous but we were not lethal with the four or five counters we had.
"It's not a dramatic loss. Losing 2-1, we are still in the race.
"Bearing in mind we were playing a very good strong team the performance of our players was tactically very good. I repeat we could have been more lethal on the counter.
"The players did well, and not just the four defenders. We also had midfielders who did good defensive work. We had to reshuffle. Two weeks ago we played with Zouma and Terry, meaning also the full-backs had different positions. I'm happy with all their performances.
"They know how to defend. We also have the quality to outplay their midfield one on one which we did several times with Willian. Their defence has to make choices as well.
"They have a nose for creating danger where you are weak. You must be very alert because if you lack concentration for three or four seconds they will take advantage as they did for their second goal.
"There are some weeks to prepare for it and I hope everyone is on board for the second leg."