Transfer window: Norwich's Daniel Ayala joins Middlesbrough

Middlesbrough have signed Norwich defender Daniel Ayala for fee thought to be £350,000, after a loan spell.

The Spaniard, 23, has made 12 league starts since joining Championship Boro in October, double his tally during two-and-a-half years at Carrow Road.

Ayala spent last season with Nottingham Forest, but did not play after the New Year's Day defeat by Blackburn Rovers.

He has agreed a three-and-a-half-year deal, and becomes head coach Aitor Karanka's first permanent signing.

Karanka was appointed boss in November, and since then goalkeeper Shay Given, defender Kenneth Omeruo and midfielder Nathaniel Chalobah have all arrived on loan deals.