 He was signed to bring in defensive cover after first-choice left back Neil Taylor was ruled out for the remainder of 2012–13 with a broken ankle.Tiendalli made his Swansea debut in the third round of the League Cup, providing an assist for Danny Graham in a 3–2 win over Crawley Town.Having been on the bench in the league for two months since joining Swansea City, as a result of Ben Davies and Àngel Rangel being first choices in the left and right back position respectively (Tiendalli played in both positions), Tiendalli finally made his league debut, coming on as a substitute for Jonathan de Guzmán in the 74th minute of a 2–0 win over Arsenal.