AZ Alkmaar remain in contention to clinch a Europa League berth from the Eredivisie after a 2-0 win at FC Twente.
After the title was taken away from them on Saturday, Ajax were held by struggling NAC Breda at home on Sunday.
Champions Ajax delayed PSV's impending Eredivisie title win for another week as they won 2-0 away at Heracles Almelo.
Ajax lost more ground on Eredivisie leaders PSV Eindhoven after they were held to a 1-1 draw by Utrecht.
It was a day to forget for Utrecht defender Ramon Leeuwin as he scored an own goal and was sent off against Ajax.
Ajax have signed striker Arkadiusz Milik on a permanent deal from Bayer Leverkusen.