Erwin Koeman took heart from Georginho Wijnaldum's display during the defeat by Groningen.
Feyenoord were thrashed at home and the only positive for Koeman was the display of Wijnaldum.
"I found that Georginho played very well," Koeman told the club's official website. "He took initiative, was strong and added some quality.
"He was the best Feyenoord player on the pitch and it says a lot that a 16-year-old debutant rose above everybody."
Feyenoord, meanwhile, will face Chelsea in a friendly at De Kuip on 25th July.
The club have also decided against offering a new contract to Joonas Kolkka.
The Finn joined the club last summer from ADO Den Haag, but has not done enough to earn an extension and will be allowed to leave in the summer.