Ajax were held to a goalless draw by Eredivisie strugglers NAC Breda, who were reduced to 10 men late on at the Amsterdam ArenA on Sunday.
Stoke are showing an interest in former Ajax forward Gino van Kessel with a view to a summer swoop.
Champions Ajax delayed PSV's impending Eredivisie title win for another week as they won 2-0 away at Heracles Almelo on Saturday.
Former Newcastle loanee Luuk de Jong scores to help PSV Eindhoven stretch their lead to 13 points over title rivals Ajax.
It was a day to forget for Utrecht defender Ramon Leeuwin as he scored an own goal and was sent off against Ajax.
Ajax lost more ground on Eredivisie leaders PSV Eindhoven after they were held to a 1-1 draw by Utrecht.
AJAX have completed the signing of Bayer Leverkusen striker Arek Milik.
Ajax have signed striker Arkadiusz Milik on a permanent deal from Bayer Leverkusen.