Feyenoord coach Fred Rutten expects to miss out on Manchester City striker John Guidetti.
The Swede, on-loan this season with Celtic, is interesting Feyenoord and Sporting CP as his contract runs down next month.
"If we do the math, you realize he can earn more with Sporting," lamented Rutten.
"It's a similar situation to what happened with Dirk Kuyt.
"He headed to Fenerbahçe to make money and now will return next season."