Salah continues to be linked with Real Madrid.
But Yakin told BBC Sport: “When you are happy at a club and having a good time with everything and everyone there is no reason to change the club.
“And also he has a long time to come - we will see what the future will bring.
"He is strong mentally and has the focus on football. He is not interested in everything else."
Yakin was full of praise for Salah's character and hailed him as a “leader".
He added: "Mo is very humble and modest. He is really down to earth and also sympathetic off the pitch.
“But on the pitch he is a leader, smart and aggressive in a good way."