The flamboyant coach has slammed the attacking midfielder over his transfer and has little doubt that his former club will win the Bundesliga this term
The Germany international left Jurgen Klopp's side for Bayern after the Bavarians triggered his €37 million exit clause earlier this year, but Magath feels the 21-year-old Gotze should have given Dortmund back more than 'just' a lucrative transfer fee.
"I don't understand how someone can give back so little to the club that raised him as a footballer," Magath told the Bayerischen Rundfunk.
Magath believes Bayern will once again dominate the Bundesliga, even suggesting they will go the whole season undefeated.
"I'm convinced Bayern Munich will win the German championship. I don't think any team will be able to compete with them, from my point of view, the first place is taken already," he added.
"Bayern probably won't lose a single match, an end of their dominance is not in sight. In the long run, that's unhealthy for the league and even for Bayern."
Bayern kick off the new season on Saturday when they meet Dortmund for the German Supercup.