ever present for the club's campaign in the UEFA Youth League, where he made eight appearances, scoring once in a 6–0 win over Bayern Munich. Denayer also played a huge role in domestic competitions where he helped the club finish fourth in the Professional U21 Development League, as well as reaching the final of the U21 Premier League Cup. In pre-season during July 2014, Denayer was included in the first team and started in a 2–0 friendly loss away against Dundee. On 10 July 2015, it was confirmed that he would be in the club's squad for their pre-season tour in Australia. Denayer signed a new five-year deal on 13 July 2015. Loan to Celtic On 12 August 2014, Celtic signed Denayer on a season-long loan from Manchester City, making him one of Ronny Deila's first major signings as Celtic manager. Denayer revealed that Vincent Kompany and Patrick Vieira played a vital role for him in joining the club. He scored on his debut and was named man of the match in a 6–1 victory at home to Dundee United in the Scottish Premiership. Four days later, on 20 August 2014, Denayer made his Champions League debut, in a 1–1 draw against Maribor, where he was part of the starting line-up. His second goal came in a 2–1 win over Aberdeen on 13 September 2014. The defender scored again for Celtic on 18 October 2014, in a 5–0 win over Ross County. By the end of December, Denayer had made 17 appearances for Celtic and formed a solid partnership with Virgil van Dijk in central defence. Denayer commented about playing alongside Van Dijk: "We play well together and he is a very good player", adding "I am also learning from him as well. He has more experience than me and he knows what to say to me. I listen to him because I know he can help make me a better player." Just months after arriving at Celtic, reports claimed that Celtic were keen to extend Denayer's loan spell by another year. However, Denayer immediately ruled out joining Celtic on a permanent basis, insisting that he hoped to earn a first team place at Manchester City in the near future. Manchester City kept an eye on Denayer's progress at Celtic, with Development Side coach Patrick Vieira stating "When I watch Jason playing for Celtic, or Marcos Lopes playing at Lille,