Britney Spears is not going back to Vegas for another residency … not in the near future, and maybe never, TMZ has learned.

Our sources tell us Britney is not in mental or physical shape to resume rehearsals for the series of shows, which were supposed to kick off back in February.

Britney’s longtime manager, Larry Rudolph, tells TMZ, “As the person who guides her career — based on the information I and all of the professionals who work with her are being told on a need-to-know basis — from what I have gathered it’s clear to me she should not be going back to do this Vegas residency, not in the near future and possibly never again.”

Rudolph is not involved in Britney’s conservatorship — never has been — and he is only given medical information that directly impacts Britney’s career. He says Britney was 2/3 of the way through rehearsals for the reboot when her dad got ill late last year.