Real Madrid have re-signed Casemiro from Porto.

Porto had expressed an intention to sign Casemiro permanently after last season's successful loan.

But Marca says Real have triggered the buy-back option in Casemiro's deal, which sees them shell out €7.5 million to Porto.

Casemiro will now start preseason with Rafa Benitez's first team squad.

Should Los Blancos change their mind and decide to sell Casemiro or include him as part of a transfer deal, Porto will be compensated to the sum of €15m (€7.5m more than the original buy-back fee).