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Per the infobox documentation, the year ranges are for years contracted to each club. The article states that he was to leave Chelsea for SIPG in the January 2017 transfer window, sourced to this BBC report, which in turn cites Chelsea F.C.'s announcement that he "will join the Chinese Super League team at the beginning of the January transfer window". He was contracted to Chelsea up to the point at which he joined SIPG in January 2017, so the year of his leaving Chelsea must also be 2017. cheers, Struway2 (talk) 10:02, 4 February 2019 (UTC)[reply]