The 3-0 round of 16 second-leg loss at Stamford Bridge saw Chelsea eliminated 8-2 on aggregate.
Asked by ESPN if he would be with the club next season, Enzo said: "I don't know, there are eight games left and the FA Cup. There's the World Cup and then we'll see."
The Argentina midfielder was hooked on the hour mark during the defeat.
"I think we failed to control the game. In the first leg, we lost focus in the final 15 minutes and conceded three goals, and here it happened at the very start," added Fernandez, who captained the side in Reece James' absence.
"At this level, you can't concede two goals so quickly because of small details. Ultimately, over the two legs, PSG were the better side and deserve to go through.
"Since I arrived at Chelsea, we have already passed through similar situations and we were able to turn them around.
"Now, our focus must be on winning the FA Cup and achieving our goal of qualifying for next season's Champions League."