Mainz
The Bavarians, eight points clear with four matches left, could seal their 34th league crown with a win over Mainz should second-placed Bayer Leverkusen fail to beat Augsburg.
The Bundesliga leaders, who lacked their usual efficiency up front while also allowing the visitors enough space to attack, needed a mistake by Mainz keeper Robin Zentner to snatch the win.
Bayern are ten points clear at the top of the league and an away win at Mainz will guarantee the title with three games remaining.
German police said they arrested a 26-year-old Syrian man who is wanted in the Netherlands on suspicion of preparing to commit a terrorist attack there.
Muto's move was completed on Thursday after he was granted a work permit.
