Arsenal, Liverpool, Everton scout Feyenoord pair Janmaat, De Vrij
The Holland international rated the strike the best of his career.
Both players have turned down new contract offers and Feyenoord chief Martin van Geel conceded last week they could be sold over the summer.
"Last week I gave the club my answer," said Janmaat, "and now we'll have to wait and see."
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