Former Brighton boss Potter was dismissed by Chelsea on 2 April after less than seven months in charge and having spent £550m on new players this season.
Asked if Englishman Potter will return to a big job soon, Koulibaly, who joined from Napoli last summer, replied: “I think so. He is a nice manager, a nice person and helped me a lot.
“It is true I had difficult moments when I first came here to Chelsea, but his staff were really important and they helped us a lot. I feel sorry for him but it is part of the job.
“I hope that he will have a nice future but now we are all concentrated on Chelsea and Frank Lampard.”
Source: BBC Sports