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Coach of Ajax Amsterdam Frank de Boer sits in the team's coach following a 1-1 draw against De Graafschap Doetinchem during the Dutch Eredivisie match in Doetinchem, on May 8, 2016. PSV Eindhoven clinched their 23rd Dutch league title with a 3-1 defeat of PEC Zwolle after title rivals Ajax were held 1-1 at De Graafschap. / AFP / ANP / Olaf KRAAK / Netherlands OUT (Photo credit should read OLAF KRAAK/AFP/Getty Images)

Coach of Ajax Amsterdam Frank de Boer sits in the team's coach following a 1-1 draw against De Graafschap Doetinchem during the Dutch Eredivisie match in Doetinchem, on May 8, 2016.
PSV Eindhoven clinched their 23rd Dutch league title with a 3-1 defeat of PEC Zwolle after title rivals Ajax were held 1-1 at De Graafschap. / AFP / ANP / Olaf KRAAK / Netherlands OUT        (Photo credit should read OLAF KRAAK/AFP/Getty Images)