REAL BETIS OFFICIALLY SELLS SIERRA TO ESTORIL: DEAL DONE

The promising young centre-half completes a transfer to Estoril for a reasonable transfer fee.

Betis will maintain a buy-back option and also hold a 45 per cent cut of any sell-on fee.

Betis coach Manuel Pellegrini approved the departure as there was little chance of regular first  team football for Sierra this season.

Should he impress in Portugal, Betis will seek to buy him back.