 Having impressed from limited opportunities during the 2010 season, on 11 December 2010, Hines replaced the suspended David Wheater alongside Matthew Bates in the starting line up of Middlesbrough's defence for the club's 1–0 victory over Cardiff, where he was rewarded with the Man of the Match award.Seb continued to impress with assured performances at the heart of the Middlesbrough's defence with a cool display in the draw at Preston North End and another commanding showing in the 2–0 victory over Scunthorpe United on 1 February 2011 in which the highlight was a fine measured lob by prolific goalscorer Kris Boyd which brought about his 200th career goal.For his performance, Hines signed a contract with the club, keeping him until 2013.