Middlesbrough have completed the signing of the 31-year-old from Aston Villa.
He left on a free transfer and passed his medical. The American made 170 appearances for his former club and joined them in 2008 from Chivas.
The club announced the news via Twitter:
CONFIRMED | #Boro have agreed a deal to sign United States international Brad Guzan - https://t.co/8BNZMbtXoI #UTB pic.twitter.com/SuT9MuzH3W
— Middlesbrough FC (@Boro) 29 de julio de 2016