Brighton & Hove Albion
The 22-year-old joined Brighton from Viktoria Plzen last summer but spent the majority of the campaign with the club's Under-23 team in Premier League 2.
Mateju never even made the bench for a senior Premier League game and his only appearances of the season came in EFL Cup ties against Barnet and Bournemouth.
A Czech Republic youth international at every level from Under-16 through to Under-21, Mateju will hope to get some first-team football under his belt with Brescia in Serie B.
He remains under contract with Brighton until the summer of 2020.
Roberto Baggio, Pep Guardiola, Andrea Pirlo and Gheorghe Hagi are among the legendary names who have previously played for Brescia.