On 31 July 2011, he suffered a cut above the eye and a slight concussion during a heading duel in a league match between Ried and Rapid Wien.

But Peter Vogl, then honorary president of SV Ried and CEO of Red Bull Salzburg, hired Glasner as management assistant, responsible for sports.

Glasner asked Ralf Rangnick for an opportunity in coaching, and in July 2012, he became assistant manager to Roger Schmidt in the first-team squad.

After their successful two-year spell at Salzburg, finishing as Austrian champions, Glasner did not follow Schmidt to Leverkusen in the German Bundesliga, but instead was appointed manager at his former club Ried for the 2014–15 season.

[8] Glasner left Wolfsburg after two seasons, despite qualifying for the Champions League, due to a poor relationship with sporting director Jörg Schmadtke and some players including club captain Josuha Guilavogui, who said, "I'm happy he's gone.

Frankfurt appointed Axel Hellmann as the new chairman of the board, Markus Krösche succeeded Fredi Bobic as managing director for sport, Ben Manga replaced Bruno Hübner as sporting director and the team lost its top scorer, André Silva, to RB Leipzig.

Frankfurt were close to the relegation zone in November, managing to win only one league game during the first months – against Bayern Munich at the Allianz Arena.

[15] Though they were fourth at the halfway point, Frankfurt only finished seventh, winning two of their last three matches to secure qualification for the Europa Conference League.

On 19 February 2024, Glasner was appointed manager of Premier League club Crystal Palace, signing a contract until the end of the 2025–26 season.

[17][18] He did not take charge of the match against Everton that day, which was overseen by interim manager Paddy McCarthy; he was instead seen watching the 1–1 draw from the Goodison Park stand alongside chairman Steve Parish.

[22] On 6 May, he led Palace to a 4–0 win over Manchester United at Selhurst Park to complete their first ever Premier League double over the club.