Middlesbrough are in talks to sign U.S. goalkeeper Brad Guzan from Aston Villa, sources close to the North East club have told reporters. Guzan's future at Villa has been in doubt since the club's relegation and the Championship club are willing to let him move on as they look to trim their wage bill. The 31-year-old came in for criticism from some fans last season as Villa struggled and he lost his place in the starting XI to Mark Bunn for the final few weeks of 2015-16. The recent arrival of goalkeeper Pierluigi Gollini from Hellas Verona has raised further questions over Guzan's future at Villa Park with the Italian expected to be No. 1 under Roberto Di Matteo next season.< Middlesbrough have already signed former Barcelona and Manchester United goalkeeper Victor Valdes this summer and they want to bring in Guzan to provide cover and competition for the Spaniard as they prepare for life back in the Premier League. Guzan was first-choice keeper for United States during this summer's Copa America as they reached the semifinals and he is keen on staying in the Premier League. The shot-stopper, who joined Villa from Chivas in 2008, has made over 150 appearances for the club and Villa are prepared to let him leave on a free transfer to speed up his departure with the player entering the final year of his contract.