The Blues have been strongly linked with the 28-year-old in recent weeks as they attempt to bring a new stopper to the club to replace the underperforming Kepa Arrizabalaga.
However, according to Djily Dieng, "the two parties have come to an agreement", meaning that a transfer could be completed and announced before the end of the week.
"The two parties have come to an agreement. All that's left is the formalisation," Dieng told Stades. "It could even be done tomorrow, if all goes well. Afterwards, the player will come to finalise everything, including having his medical examination."