The influential midfielder was plagued by injury problems throughout last season and missed a number of games for Bayern but recovered in time to feature prominently at the World Cup with Germany.
Bayern granted the 29-year-old a three-week holiday after he guided the national team to glory at this summer's tournament but Muller-Wohlfahrt feels that Schweinsteiger needs at least twice as long in order to fully recover from his exploits in Brazil after a gruelling 2013-14 season.
"Schweinsteiger needs at least a six-week break," the Bayern doctor told Eurosport.
The midfielder missed Germany's World Cup opener against Portugal and was on the bench for the game against Ghana but featured from the start in the world champions' remaining five games.
Schweinsteiger made 36 appearances in all competitions for Bayern last season.
The Bavarians kick off the new Bundesliga season at home against Wolfsburg on August 22.