Lammers has been under contract with Rangers FC since last summer. The Scottish club took him over from Atalanta Bergamo (19 matches, 2 goals). Lammers is still under contract with Rangers FC until mid-2026. So far he has scored twice in 31 matches for Rangers. He previously played for PSV (29 matches, 6 goals), Heerenveen (35 matches, 19 goals), Eintracht Frankfurt (22 matches, 2 goals), Samporia (20 matches, 1 goal) and Empoli (14 matches, 1 goal). .