human being, I belong here 100 per cent." Şahin also said "I noticed quickly that I only want to play for Dortmund." His return move delighted manager Jürgen Klopp. Prior his debut in the friendly match against Mainz, in which Dortmund won on penalties, Şahin said he was quite nervous for his return. Eight days later, he made his first league appearance, since leaving Dortmund, coming on as a substitute in a later minute, as Dortmund defeated Werder Bremen 5–0. On 16 March 2013, Şahin scored two goals in a 5–1 Dortmund victory over SC Freiburg. On 27 July 2013, Şahin won the 2013 DFL-Supercup with Dortmund 4–2 against rivals Bayern Munich. On 26 October 2013, Şahin scored a goal for Dortmund in the Revierderby against rivals Schalke in a 3–1 win for Dortmund. On 10 April 2014, Borussia Dortmund activated a clause in Sahin's contract that allowed him to return permanently for a fee reported to be in the region of €7 million. The preparation for the 2014–15 season was marked by injuries; he was sidelined early on due to an irritation in the joint capsule of his knee and tendinitis. In September 2014, inflamed tissue was removed from Sahin's left knee. After the surgery, he was out for around nine weeks, and returned to team practice on 12 November 2014. After playing seven league games, Şahin was diagnosed with tendon irritation in the upper adductor area in March 2015, whereupon he was sidelined for the rest of the season and for the entire first half of the 2015–16 season. After a break of almost a year, he made his comeback in the UEFA Europa League game against Porto on 18 February 2016. After İlkay Gündoğan's move to Manchester City, Şahin received his old shirt number 8 back. On 25 April 2017, Şahin extended his contract with Dortmund by another year until 2019. Werder Bremen On 31 August 2018, the last day of the 2018 summer transfer window, Şahin joined Bundesliga rivals SV Werder Bremen. According to media reports, he signed a two-year contract moving to the club on a free transfer. As a defensive midfielder, he was originally intended to be the successor to the departed Thomas Delaney, but initially alternated in this position with Philipp Bargfrede and made 23 appearances in his first season, in which he was able to both score and assist a goal. In