Celtic have signed Georgios Giakoumakis from VVV-Venlo in a deal worth up to £2.5m with the striker signing a five-year contract.
Ajax set a new Eredivisie record by thrashing 10-man VVV-Venlo 13-0 on Saturday.
Lee Cattermole has signed a one-year deal with VVV-Venlo after a successful trial period with the Eredivisie side.
Ajax edged three points ahead of PSV Eindhoven in the Eredivisie title race with a hard-fought 1-0 win at FC Groningen.
Klaas-Jan Huntelaar scored a hat-trick as Ajax moved three points clear at the top of Eredivisie with a comfortable 6-2 victory against struggling Excelsior.
PSV Eindhoven's Eredivisie title chances were dealt a blow as they had to settle for a 3-3 draw away at 10-man Vitesse.