Cambuur Leeuwarden beat ADO Den Haag 3-2 in the Eredivisie, while AZ Alkmaar grabbed a 3-1 win over FC Dordrecht.
Heerenveen claim they have been approached by Middlesbrough over winger Yanic Wildschut.
Willem II beat AZ 3-0 for their first points of the Eredivisie season on Saturday, while Heerenveen also won.
Feyenoord's bid to start the campaign with back-to-back wins was frustrated by 10-man Heerenveen as they were held 1-1.
Sky Sports understands Stoke and Sunderland are among a host of clubs tracking Swedish winger Nabil Bahoui.
FC Twente needed a late equaliser from Youness Mokhtar to salvage a 1-1 draw at Cambuur Leeuwarden.
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