The 23-year-old midfielder, currently on loan to PSV from Chelsea, scored his side's final goal in a 3-0 away victory after Luuk de Jong and Jurgen Locadia had put the visitors in the driving seat with strikes either side of half-time.
Phillip Cocu's men could afford no slip-ups after second-placed Ajax eventually overcame Groningen on the road.
The Amsterdam side were held for almost an hour before they finally edged in front when Anwar El Ghazi fired home from close range after running on to Nemanja Gudelj's knock-down.
They doubled their advantage from the penalty spot 10 minutes later when, after Hans Hateboer had fouled Amin Younes, Lasse Schone made it 2-0, and Danny Hoesen's injury-time free-kick provided little consolation as Ajax ran out 2-1 winners.
Feyenoord's fading hopes of a top-four finish were dealt a blow when they went down 3-1 at Zwolle, their seventh league defeat on the trot.
The sides went in level at the break after Feyenoord's Sven van Beek had cancelled out Lars Veldwijk's 15th-minute opener, but Veldwijk's second and a late effort from Kingsley Ehizibue handed the points to the hosts.
At the bottom of the table, Excelsior remain in trouble after extending their run without a victory to 11 games with a 4-2 home defeat by Den Haag.
They led 2-1 with 12 minutes remaining after Tom van Weert's double had overhauled Kevin Jansen's ninth-minute strike, but a brace from Dennis van der Heijden and a fourth from Mike Havenaar dashed their hopes.