On 21 March 2018, Lema signed his first professional contract with
Sturm Graz. Lema made his professional debut for Sturm Graz in a 0–0
Austrian Football Bundesliga tie with
Rheindorf Altach on 27 May 2018. In December 2019 it was confirmed, that Lema would join
TSV Hartberg on loan from January 2020 until the end of the season. At the end of the 2020–21 season, he moved to Hartberg on a permanent basis. On 8 February 2022, Lema signed with
Lafnitz. ==International career==