Youth career At the age of four, Günter joined the football club FV Tennenbronn. As a 13-year-old, he was invited to trial training by
SC Freiburg. From then on he went through the club's youth teams. In 2012, he won an important title as captain of the A-Juniors team, the
DFB-Pokal der Junioren (youth DFB-Pokal).
Beginnings in professional football Günter's professional career began in the 2012–13 season, when he was included in the SC Freiburg's professional squad; he became the new replacement for left-back
Oliver Sorg. Günter was included in the professional team's squad for the first time on 17 November 2012. A few weeks later on 8 December, he finally made his debut for the first team in a 1–0 win against
Greuther Fürth. As a substitute, he replaced
Vegar Eggen Hedenstad in the 77th minute of the game. Günter played his second game again as a substitute in the
DFB-Pokal on 18 December against
Karlsruher SC. In total, he played eight competitive games in his first season. The following season, SC Freiburg played in the
Europa League. Günter made his first appearance of the new campaign in the DFB-Pokal against
TSG Neustrelitz. In the following months, he was used more often by coach
Christian Streich, as the two full-backs Hedenstad and
Mensur Mujdža were temporarily unavailable. On 19 September 2013, Günter made his debut in European competition against
Slovan Liberec. However, his team was eliminated after the group stage of the Europa League. In March 2014, Günter extended his contract at SC Freiburg early.
Regular player at SC Freiburg On 8 November 2014, the 11th matchday of the 2014–15 league season, Günter scored his first goal in the
Bundesliga, coming in the 22nd minute of a 2–0 win against
Schalke 04. At the end of the season, in which Günter played in every Bundesliga match for the club, Freiburg were relegated to the
second division. However, in the following season, The side would become 2. Bundesliga champions, earning immediate promotion back to the first league. Günter continued to be a regular player in the left-back position for Freiburg in the following season. After only missing two matches in the following three Bundesliga seasons, Günter was elected team captain of the club in 2020. In addition, Günter also decided to wear a captain's armband in
rainbow colours in order to set an example for more tolerance and against exclusion. In March 2021, he made a further contract extension at the club for an unknown term. Günter became Freiburg's Bundesliga record player on matchday 2 of the 2021–22 season with his 237th appearance, breaking
Andreas Zeyer's previous club record. In July 2024, Günter was named as the club's captain ahead of the
2024–25 season. == International career ==