Reports suggest that the 27-year old midfielder has emerged as a strong target for the newly-promoted Premier League side but Feyenoord's technical director Martin van Geel says they would reject any bid if it were to land in the De Kuip's inbox.
"Lex Immers is not for sale. He is crucial to our way of playing. The same counts for Graziano Pelle," van Geel told Voetbal International.
"We want to keep these players and otherwise any negotiations will be hard. That is the advantage of long-term contracts instead of short or loan deals."