Nicolas Tagliafico has signed a new contract that will keep him at Ajax until 2023.
Ajax became the first team to score 13 goals in a single Eredivise game with a thumping 13-0 win over VVV-Venlo.
Bundesliga side Werder Bremen has confirmed that Netherlands playmaker Davy Klaassen is in talks with Dutch giant Ajax and could leave before the transfer window closes on Tuesday (AEST).
Arjen Robben lasted just 30 minutes on his Eredivisie comeback as Groningen went down 3-1 to PSV.
Daley Blind has returned to full Ajax training after collapsing during a pre-season friendly against Hertha Berlin.
Ajax sporting director Marc Overmars said the club's chances of re-signing Barcelona star Luis Suarez are "quite small".