 At the end of the 2012–13 season, Tiendalli's agent Sebastien Casenaz told talkSPORT that he would not be at Swansea for the next season after contract talks had broken down.On 28 August 2013, however, Tiendalli re-joined Swansea on a three-year contract lasting until June 2016.On 26 March 2015, Tiendalli was loaned out to promotion-chasing Middlesbrough of the Championship for the remainder of the 2014–15 season.