Declan John
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Declan Christopher John (born 30 June 1995) is a Welsh professional footballer who plays as a left wing-back for Swansea City and the Wales national team.

Born in Merthyr Tydfil, John progressed through the academy at Cardiff City. His professional debut for Cardiff came on 14 August 2012, in a 2–1 home defeat to Northampton Town in the first round of the Football League Cup. On 5 January 2013, he made his only other appearance of the season, a loss by the same margin at Macclesfield Town in the third round of the FA Cup.

John made his league debut on 17 August 2013 in a 2–0 loss at West Ham United, Cardiff's first game in the Premier League. He signed a long-term contract until 2018 in December. He went on to make 20 appearances that season, appearing more frequently in the second half of the campaign, as the Bluebirds were relegated.

Under new manager, Russell Slade, John fell down the pecking order and was subsequently loaned out to Barnsley for the remained of the season. He made nine appearances for the Tykes before returning to Cardiff at the end of the season.