In a statement released by the club, Bayern's sporting director said: "“We are very pleased that Mathys Tel has extended his contract with FC Bayern.
"He is an important building block for the future of this team, with him we already have the next generation of FC Bayern in our squad.
"Mathys came to Munich as a young player and, at the age of 18, has already gained important experience at the highest level. He will make a lot of exclamation marks – here, at FC Bayern.”