Chambers scored in the 4-3 defeat at home to Liverpool on the opening day of the season but has now made the temporary move to Teesside.
Boro have performed well on their return to the Premier League, winning one and drawing two of their three matches to date, including a goalless draw at West Brom on Sunday.
Chambers will further boost Aitor Karanka’s defensive options as they attempt to re-establish themselves as a top-flight club.
He could be in line to make his debut at home to Crystal Palace on September 10, when the Premier League resumes after the international break. NaijaBet.com
Chambers becomes the 10th player to arrive at the Riverside over the summer.
