Nice are still sat top of the table thanks to their stunning start to the Ligue 1 campaign but their recent form has caused concern amongst their fanbase.
They were expected to cruise past Bastia on Sunday but they were held to a 1-1 draw despite dominating large parts of the game.
Nice have been top since late September but they are now just one point above Monaco and PSG who sit on their heels.
Striker Mario Balotteli will be missing from Wednesday's trip to Guingamp due to a calf problem and Eysseric admits his side cannot afford to feel comfortable at the top.
He told reporters: "I am not worried. I just hope that our concentration doesn't drop and we don't start believing we have achieved something.
"For the moment we have achieved nothing and it is a very long season."