Bayern Munich coach Guardiola left Barca under a cloud three years ago.
Bartomeu said: "We learned a lot from Pep Guardiola, who is a genius. People who are Barca and leave Barca in the heart, will return and help the club.
"I see many people who in the future will be with ... Barça.
"After 2022 many of the players who are here now, or others who are in other teams, will return to Barça as coaches, athletic directors, presidents ... because, after all, we are like a family."
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