"He was very professional in two stints with us, of course," Williams told the Lancashire Telegraph.
"I remember Stephane when he first joined us as a young man from Switzerland. It was Roy Hodgson's first signing, he came to us with Martin Dahlin.
"It was a real baptism of fire for him in the Premier League, but he stood up to the test.
"Eventually, when we got relegated, it reached a point for Stephane where he needed to move on and he had plenty of success with Liverpool.
"Mark Hughes brought him back, under different requirements and different times.
"He was a great lad to have around - he always gave 100 per cent and we wish him all the best for the future."