*Club domestic league appearances and goals, correct as of 13:37, 15 October 2024 (UTC) ‡ National team caps and goals, correct as of 18:29, 30 November 2024 (UTC)
Lammens began his career at the youth academy of Club Brugge. On 11 December 2019 the then 17-year old goalkeeper scored the decisive headed goal (2-2) against Real Madrid CF (youth) in the 95th minute of the play-off match in the 2019–20 UEFA Youth League group stage, enabling his team to reach the knock-out phase of the tournament.
On 8 June 2023, Lammens signed a four-year contract with Royal Antwerp.[1]