Porto will sign midfielder Casemiro from Real Madrid on a permanent basis.

Casemiro spent the 14-15 season on loan from Real Madrid and made 41 appearances.

As part of his loan deal, there was a clause that Porto had an option to make the move permanent at the end of the season. 

Real Madrid can decline the offer and repurchase Casemiro, but they will be required to pay Porto compensation.

Real Madrid signed Casemiro on a permanent deal from Sao Paulo in 2013, but he made just 12 appearances in 2013-14 before leaving on loan.