Date of birth
A look at the Czech defender's career.
Ales Mateju completed his move to Brighton & Hove Albion in the summer of 2017, on undisclosed terms from Czech side Viktoria Plzen.
Mateju was a regular for top-flight Plzen before making the move, and helped the club win the Czech championship in 2016.
The defender began his professional career with his hometown club Pribram, before spening the 2013/14 season on loan to PSV Eindhoven, where he played for the under-19s.
He signed for Plzen in 2015 and helped them become champions in his first season at the club, and to a runners-up spot and Champions League qualification in 2016/17 - and has played for the Czech Republic from under-16 through to under-21.