Lynen spent his early career with Borsbeek Sport,
Royal Antwerp,
Westerlo,
Lierse and
Club Brugge. Having spent the second half of the
2017–18 season at
Eerste Divisie club
Telstar on loan from Club Brugge, Lynen made a permanent move to Telstar in 2018, signing a two-year contract. On 8 August 2023, Lynen signed with
Bundesliga club
Werder Bremen from Belgian Pro League side
Union SG. The transfer fee paid to Union SG was reported as €2 million. ==International career==