Nils Rossen (born 1 August 2004) is a Dutch professional footballer who plays as a midfielder for Eredivisie club Telstar. Career Early years Rossen was born in Wijchen, Gelderland. As a child he played for local amateur club Alverna, and in 2013 – at age eight – he joined the Voetbal Academie NEC, the youth academy of NEC. NEC Developing at NEC, Rossen progressed through the youth teams to the under-21 squad. In December 2021, at age 17, he signed his first professional contract with the club, a deal running until 30 June 2024. He was occasionally involved with the first team and was invited to NEC's mid-season training camp in Spain in early 2022. Rossen made his senior debut for NEC on 1 September 2023 in an Eredivisie away match against Sparta Rotterdam, coming on as a substitute in the 76th minute for Lars Olden Larsen. The match ended in a 1–1 draw. Over the 2023–24 season, he made a total of four first-team appearances for NEC – three in the Eredivisie and one in the KNVB Cup – totaling only 29 minutes of playing time. NEC had an option to extend his contract by one year but chose not to exercise it, as the club's technical director Carlos Aalbers felt Rossen's development had been inconsistent. His contract was not renewed and he left NEC as a free agent in July 2024.