Ribery ended a 12-year association with Bayern before joining Fiorentina on a free transfer for 2019-20.
Nevertheless, the veteran former France attacker believes new recruits such as Ivan Perisic and Philippe Coutinho, along with the likes of Serge Gnabry, Kingsley Coman, Thomas Muller and Robert Lewandowski, leave Bayern amply stocked in attacking areas.
"Sancho is a good player, but Bayern have enough good players in this position - where should he play?" Ribery said in an interview with Sport Bild .
"There is Muller, Gnabry, Perisic, Coman, Coutinho, Lewandowski. There is a lot of competition. I hope Sancho confirms his good year, but there would be little room for him in the Bayern squad."
"Serge is still young, but he has character, personality," Ribery said. "He plays without fear."
"After his four goals against Tottenham, more is expected, but Serge is a man, not a machine.
"It's not easy to show top performances in every game, but Serge will continue on his way without putting too much pressure [on himself]."
Ribery also feels the burgeoning alliance between star striker Lewandowski and on-loan Barcelona playmaker Coutinho will continue to yield handsome returns.
"Bayern can now play different variations and Coutinho is good for Robert Lewandowski," he added.
"He always wants the ball; Coutinho takes responsibility and serves his team-mates - either the outside striker or just Lewy, who receives great passes."
FCB currently lie third in the Bundesliga, with a couple of defeats in seven matches having put Niko Kovac's side under early pressure.