Manchester United will have to make huge bonus payments to Ajax for new centre-back Lisandro Martinez every time the defender plays for the club.
United completed a £55million move for the Argentinian, but the completed deal means that Ajax will cash in every time Martinez plays for his new club.
Ajax will be paid an eye-watering £56,000 bonus for every appearance the 24-year-old makes for the Premier League side up to a maximum of 30 games a season, as reported by the Mirror.
Martinez has taken over the number six shirt vacated by Paul Pogba and could end up costing United over £1.6million in bonus payments per season to his former club.
The former Ajax player-of-the-year has signed a five-year contract until 2027 with an option for a further year as new boss Erik ten Hag's looks to build a new team capable of competing for trophies.
Defensive reinforcements were a top summer priority after the club finished the previous season with a zero-goal difference marking their worst ever Premier League season.
The Old Trafford outfit agreed to the eyebrow-raising bonus demands in an attempt to beat Arsenal to the signing of the versatile defender.
Martinez will earn a reported £120,000 a week and becomes the club's third summer signing following the arrivals of Tyrell Malacia and midfielder Christian Eriksen.
Nicknamed 'the butcher of Amsterdam', he started his career in Argentina before joining Ajax in 2019.
Martinez quickly became a fan favourite as he helped the Dutch champions to two Eredivisie league titles along with helping Argentina lift the Copa America in 2021.
He played 45 minutes in the club's behind-closed-doors pre-season friendly against Wrexham and has been included in the traveling squad to face Atletico Madrid in Oslo.
The centre-back will be hoping to get his first taste of Premier League action when United host Brighton in their opening game of the season on Sunday, August 7.