The Marseille keeper has kept five cleans sheets in a row and credits his hard work in training with his good form between the sticks
The France international found his first-team place under threat earlier this season but says his hard work on the training ground is paying dividends.
"You have nights where you feel unbeatable," the 28-year-old shot-stopper told Canal +.
"I've been asked a lot recently. [Joey] Barton told me that it had been five matches since I conceded a goal.
"This season I've had a slightly more complicated period but now I feel good. The work in training has paid off. You must enjoy it but there are six games left to keep this concentration.
"Did I have any moments of doubt when I wasn't playing as well this season? No, because I've been here a while now and I know you can go out of form in a season. I did speak with the goalkeeping coach."
Marseille currently sit nine points off Ligue 1 leaders Paris Saint-Germain.