Sporting CP are furious seeing Joao Mario sign for Benfica.

When Inter Milan first signed the player from Sporting in 2016, there was a clause forcing the Nerazzurri to pay up to €30m if they sold him to any other Portuguese club.

Because of that, he terminated his contract with Inter yesterday and then signed for Benfica as a free agent.

“Inter refused our proposal, they rescinded the contract with Joao Mario in order to get him to sign for Benfica," Sporting said in a statement.

“It is our belief that this workaround was used to avoid a clause signed in 2016. We will defend the interests of the club and sue for damages caused by the violation of these agreements.

“In 2016, Inter and Joao Mario accepted the clause to pay an extra €30m in case of sale to another Portuguese club."