Erkin signed for Fenerbahçe in 2010. Starting out as a left winger, he was slowly transformed into a left-back. His performances with led to him being scouted by several prominent European clubs.
On 1 June 2016, Inter Milan announced the signing of Erkin, on a free transfer in a three-year deal starting on 1 July.[3][4] Erkin was the first summer transfer addition to the squad.[5] Under Roberto Mancini and new coach Frank de Boer, Erkin made seven appearances in pre-season friendlies. However, he did not make any competitive debut before leaving Inter on 30 August. Inter also ran out of players quota in 2016–17 UEFA Europa League, as the club was forced to reduce to 22-men squad (plus normal minimum requirement of homegrown and club-trained players) due to penalty of UEFA Financial Fair Play Regulations, thus Caner was sacrificed for other signings. Domestically, Inter had one quota left (plus another for an Inter-trained player), but left vacant.
Loan to Beşiktaş
On 30 August 2016, Inter Milan announced that Erkin signed a one-year loan deal with Turkish club Beşiktaş.[6]
Beşiktaş
On 7 June 2017, Beşiktaş signed Erkin for €750,000 transfer fee.[7] On 23 August 2019, Erkin scored the second goal of 2019–20 Süper Lig Week 2 home encounter, from a cross of his gone in the net, against Göztepe S.K. which ended 3–0 in favour of Beşiktaş.[8] He was released at the end of the 2019–20 Süper Lig season.
Return to Fenerbahçe
On 6 August 2020, he signed a two-year deal until June 2022 with an option for an extra year.[9] After four years at Beşiktaş, the other side of Istanbul, he returned to Fenerbahçe. On 11 September, in his first game back against Çaykur Rizespor, he assisted Gökhan Gönül's header, who was a returnee like himself.
On 4 August 2021, Fenerbahçe announced that he would not be included in the club's squad for the upcoming season according to the team's manager Vitor Pereira's decision.[10]
Fatih Karagümrük
On 6 September 2021, Fatih Karagümrük announced the signing of Erkin, as a free agent.[11]