Erik ten Hag led Ajax to the Dutch Eredivisie title with one game to spare before he starts his reign at Manchester United this summer.
The Dutch side wrapped up the league with a emphatic win over Heerenveen at the Johan Cruyff Arena.
It sent them four points clear of nearest rivals PSV Eindhoven before Sunday’s final round of games.
Ajax’s scorers were Nicolas Tagliafico, Steven Berghuis, Sebastien Haller, Brian Brobbey and Edson Alvarez.
The Dutchman, 52, will take over from interim boss Ralf Rangnick at the end of this season after he was announced in April as the new Manchester United manager on a three-year deal, which can be extended by a year.
Hag took over as Ajax head coach in December 2017 and led them to the league and cup double in 2018-19 and 2020-21.