There had been speculation over the Dutchman's future after a poor start to the season.
Richardson though, who started his career under Sir Alex Ferguson at Manchester United, believes the players are all behind Jol.
"Martin Jol is a great coach," Richardson told the Daily Express. "Since I have been in the game he is definitely one of the best managers that I've been around. Other players feel the same.
"We would all be upset [if he left]. I don't want to see him get the sack. His credentials are right up there so I don't see the need to get rid of this manager."
Fulham take on Crystal Palace in their next game on Monday.