The 21-year-old is set to end his 14-year association with the club and link up with the Hatters during their first-ever Premier League season.
Having joined the club as a seven-year-old, Teden rose through our Academy system and has featured at every age group during his time at the club.
Mengi featured predominantly for our Under-21s last season, turning out seven times across both our Premier League 2 and EFL Trophy campaigns.
He made his debut for the first-team against LASK Linz in the Europa League back in 2020, appearing as a late substitute in our 2-1 victory at Old Trafford.