From a 2018 report:
Manchester United are refusing to sell Anthony Martial because they would owe 50% of the profits to Monaco, according to reports on Saturday.
However, according to the sun, United refused to sell Martial due an agreement which brought the player to Old Trafford back in the summer of 2015.
The 22-year-old has cost £44.5million so far with further clauses yet to be activated that could push the fee as high as £57.6m.
But the paper ( sun) claims Monaco are due half of any profit – meaning United would have to flog Martial – whose contract can be extended up until June 2020 – for upwards of £100m to make just £30m on the goalscorer.
remember when the rags claimed they bought him for something like 20 million and the Monaco chairman called them out in the press and revealed the actual cost of the deal.