The Fiorentina striker played alongside the Blaugrana's former trainer when they were both at Brescia and the two have remained close since the 41-year-old left Camp Nou at the end of 2011-12, stating that he wanted some time away from football.
The Italian striker told Bild: "He asked me about Bayern. I think the philosophy of how that club is run pleases him.
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Toni advised Guardiola, who has also been linked with Champions League holders Chelsea and last season's Serie A runners-up, AC Milan, to take on the job in Bavaria instead of moving to Italy, adding: "He should definitely coach Bayern. They are one of the best teams in the world.
"In Italy [the clubs] are catching up. The only club in Italy that is comparable to Bayern is Juventus, who will be at the same level in less than 10 years."