Sporting complain to FIFA over Gelson Martins move

According to Spanish publication 'Marca', there could be another twist yet in his transfer, with Sporting refusing to accept the recision of his contract and signalling their intention to secure a fee for the player.

Atletico Madrid officially announced the youngster's capture on Wednesday, with the Portuguese international signing a six-year deal.

the player made the move to the Wanda Metropolitano as a free agent, having broken his contract with the Portuguese side after a number of bizarre incidents towards that last season that supposedly added up to "just cause".

However, the aforementioned source claims that Martins was not one of the players attacked by ultras as they invaded the club's training ground last season, meaning that his contract remains valid.

Although Sporting rate Martins at €40m, the aforementioned source claims that Atleti offered to pay €15m for 50% of the player's economic rights in order to give the club a way of losing the player with dignity.

The idea was that Atleti would allow the Portuguese side to keep 50% of the economic rights in order to benefit from a future transfer, but Sporting tried to hold out for €20m and when they rejected the offer of Vietto and Moreira on loan as sweeteners, they broke off negotiations.

Thus, Atletico announced the deal as a free transfer, with FIFA now left to resolve the issue.