Stefan Lainer (born 27 August 1992) is an Austrian professional footballer who plays as right-back for Bundesliga club Borussia Mönchengladbach and the Austria national team.
Lainer started his career with the local club SV Seekirchen. In 2006, he came to Red Bull Salzburg. In 2010, he played his first match for the second team of Red Bull. His next step was SV Grödig, where he played on loan. In 2012, he returned to Salzburg where he was in the squad of FC Liefering, the second team of FC Red Bull Salzburg.
Lainer is the son of Leo Lainer, who played for SV Austria Salzburg and the Austrian national team.
Red Bull Salzburg
On 1 July 2015, Lainer transferred to FC Red Bull Salzburg on a three-year contract for £140,000.
During the 2017–18 season Salzburg had their best ever European campaign. They finished top of their Europa League group for a record fourth time, before beating Real Sociedad, Borussia Dortmund and Lazio, thus making their first ever appearance in the UEFA Europa League semi-final. On 3 May 2018, he played in the Europa League semi-finals as Marseille played out a 1–2 away loss but a 3–2 aggregate win to secure a place in the 2018 UEFA Europa League Final.