On 7 August 2015, Young signed a new three-year contract with Manchester United, keeping him at the club until June 2018, with the option to extend a further year. Young's appearances at the beginning of the season were slim, with him making only one start in United's opening seven Premier League games, this being in the opening game on 8 August 2015, a 1–0 win against Tottenham Hotspur. On 12 September, Young played through debutant Anthony Martial to score his first goal for United in a 3–1 victory against rivals Liverpool. Young returned to the starting XI at left back on 4 October against Arsenal, ending in a 3–0 away defeat. He started at right back against West Brom on 7 November, which ended in a 2–0 win for United; this was a position he frequently played during November, December and January due to injury to Antonio Valencia. On 2 January 2016, Young assisted Anthony Martial with a cross into the box to open the scoring against Swansea City, with the game ending in a 2–1 win for United. Young suffered a 'severe groin injury' against Liverpool on 17 January which led to him being sidelined for several months. He made his return on 10 April against Tottenham Hotspur, replacing Marcus Rashford at half time, playing upfront in a 3–0 defeat. The decision to play Young as a striker saw Van Gaal face heavy criticism, however the Dutchman defended his actions by explaining he "wanted more running in behind." Young scored his only goal of the season on 17 May, the last day of the Premier League, in a 3–1 win against AFC Bournemouth after coming on as a substitute for Anthony Martial. On 21 May, he won the FA Cup after defeating Crystal Palace 2–1 in the final after extra time, playing at both striker and left back after replacing Marcus Rashford in the 72nd minute – marking his third domestic trophy with the club.