29 August 2012 as a substitute for the last 15 minutes, finishing the match with a perfect passing statistic. He played 20 matches in Barcelona's La Liga-winning campaign in his first season, and scored one goal, in a 3–1 home win against Real Zaragoza on 17 November 2012. Song was an unused substitute in the 2014 Copa del Rey Final, which Barcelona lost 2–1 to Real Madrid at the Mestalla Stadium. In August 2014, Song was subject to transfer speculation linking him with a season long loan deal to Liverpool. West Ham United on loan On 30 August 2014, Song joined West Ham United on a season-long loan. He was unveiled to the fans on the same day before their home game against Southampton. Song made his debut against Hull City as a second-half substitute on 15 September 2014 in a 2–2 draw. He played 31 games for West Ham including three in the FA Cup. Praised for his early season form, his performances deteriorated towards the end of the season as West Ham's form also slumped. In August 2015, West Ham co-chairman David Sullivan, announced an agreement with Barcelona to sign Song on a three-year permanent contract subject to a medical. His season-long loan to West Ham was confirmed on 1 September with West Ham having the option to extend the loan for a further season. Rubin Kazan On 21 July 2016, Rubin Kazan reached an agreement to sign Song from Barcelona, subject to a medical. On 1 August 2016, Song officially joined the Russian side on a free transfer after his contract with Barcelona had been terminated. In January 2018, Song trained with his old club Arsenal after being allowed to find a new club by Rubin, but was still registered with Rubin when the Russian Premier League continued on 2 March 2018 after their winter break. He was removed from their league registration list on 13 March 2018. It was reported on 2 April 2018 that Rubin sent a complaint to the FIFA Dispute Resolution Chamber, demanding 40 million euros from Song for breach of contract. Sion Song signed with Swiss Super League club Sion on a free transfer on 14 August 2018. In March 2020, Song was one of nine players sacked by Sion for refusing to take a pay cut during the coronavirus pandemic. Arta/Solar7 In November 2020, Song joined Djiboutian club Arta/Solar7 on a