the club did not offer him a new deal when his contract expired. Barnet Nelson joined Barnet on trial in 2015–16 pre-season, and signed a one-year deal on 3 August. Upon joining the club, he was reunited with Martin Allen, whom he knows during their time at Portsmouth. Nelson was also given a number six shirt ahead of the new season. On 11 August 2015, he made his debut for Barnet, starting a match and played 89 minutes before being substituted, in a 2–1 win against Millwall in the first round of the League Cup. Since joining the club, Nelson found himself in and out of the starting line–up, which saw him placed on the substitute bench. On 19 December 2015, however, he suffered a dislocated shoulder injury and was substituted at half time, in a 4–2 win against Crawley Town. Initially, Nelson was given all clear with a shoulder injury, but he was sidelined for three months. On 13 February 2016, Nelson scored on his return from injury, in a 2–0 win against Dagenham & Redbridge. Following his return from injury, he regained his first team place, playing in the centre–back position, but his form later dipped towards the end of the season and was placed on the substitute bench. At the end of the 2015–16 season, Nelson went on to make thirty–two appearances and scoring once in all competitions. On 25 May 2016, he signed a one–year contract extension with Barnet. Ahead of the 2016–17 season, Nelson was appointed as the new captain of Barnet following the departure of Andy Yiadom. He continued to establish himself in the first team in the centre–back position, as well as, regaining his captaincy. On 15 March 2017, Nelson scored his first goal of the season from an equalising header, in a 2–2 draw against Yeovil Town on 15 March 2017. Since the start of the 2016–17 season, Nelson started in every match until he was dropped to the substitute bench for three matches between 8 April 2017 and 17 April 2017. On 22 April 2017, Nelson returned to the starting line–up from the sidelines and helped the club keep a clean sheet, in a 2–0 win against his former club, Hartlepool United. Throughout the 2016–17 season, he assisted three times for John Akinde, who went on to become the club's top scorer this season. In his second season at Barnet, Nelson