The Dutch midfielder has vowed to hit top form for the Istanbul giants shortly after making his first start for Fatih Terim's side against Antalyaspor
The Dutchman has made three Super Lig appearances for the Turkish champions since completing his switch, but has failed to make a noteworthy impact.
However, he has vowed to improve has he looks to recover match fitness after a being frozen out of the Nerazzurri first team for his last four months at San Siro.
"After a long period out it was important for me to be in the starting line up. I feel good and will get better and better," he told Lig TV.
"Despite lacking match condition I was in good shape. We fought well against Antalyaspor. They were three valuable points. I played Almost 80 minutes, it feels so good. Every match I'll be better."
Galatasaray currently sit five points clear of city-rivals Besiktas at the top of the Turkish league.