During his time at Brugge, Lammens once scored a goal against Real Madrid in the 2019/20 UEFA Youth League group stages, heading home to earn a 2-2 draw and send his side through to the knock-out round play-offs. Lammens made 41 appearances last season in his first year as Antwerp's No. 1, keeping ten clean sheets as his side finished fifth in the Belgian Pro League.