In 1964, John Lennon, Paul McCartney, and George Harrison prepared to embark on a world tour without Ringo Starr. At this point, Starr had been with The Beatles for two years, but they planned to temporarily replace him. He was in the hospital with tonsillitis and missed part of the tour. Starr felt incredibly hurt by this, but it might have been a small comfort to know that Harrison fought hard to cancel the tour.
While Starr was in the hospital, the rest of the band began working with a stand-in drummer, Jimmy Nichol.
“Ringo missed part of the tour because he was in hospital with tonsillitis,” McCartney said, per The Beatles Anthology. “We couldn’t cancel, so the idea was to get a stand-in. We got Jimmy Nicol, a session drummer from London. He played well — obviously not the same as Ringo, but he covered well.”
Source: Emma McKee/cheatsheet.com