"This boy is a good professional. Never injured, gives every game one hundred percent, trains great and always stands there," Koeman told De Telegraaf.
"That is also the reason why a lot of clubs wanted to sign him.
"He played every week and has played a lot at both Southampton and Everton, although we initially had him as a backup. He could replace anyone. I think Cuco has had a wonderful career in England and now has a few good years in the Eredivisie. And Feyenoord is still a big club."