The Teesside club have seen off competition from fellow Championship side Brighton for the Huddersfield Town midfielder, who has turned down the offer of a contract extension
Middlesbrough have agreed a deal with Huddersfield Town to sign sought-after midfielder Adam Clayton, Goal understands.
The 25-year-old has 12 months left on his current contract and turned down the offer of a new deal to stay at the John Smith's Stadium.
Clayton has also been the subject of interest from Championship promotion hopefuls Brighton, but Middlesbrough look set to win the race to sign the midfielder.
The former Leeds United man is set to cost Middlesbrough an initial £1.5 million in a deal which could rise to £2m after add-ons.
Clayton started his career with Manchester City before making the move to Elland Road in 2010.
The midfielder made 84 league appearances for Huddersfield since joining the club in 2012 and scored seven goals in the Championship last season.