Rep. Michele Bachmann’s presidential campaign is undergoing significant staffing changes, with campaign manager Ed Rollins taking on a reduced role and deputy campaign manager David Polyansky departing.

Alice Stewart, a spokeswoman for Bachmann (R-Minn.), confirmed the departures late Monday. Rollins, whose decision was first reported by Politico, told The Washington Post he was too old to deal with the campaign grind.

“I am tired and am concerned about my health,” Rollins said. “Managing a campaign is tough for a young man, and I am 68 and battered by many years of campaign combat.” There was no word on who will replace him.

Polyansky’s departure will raise questions about whether the changes represent a strategic shake-up for a campaign that has taken a back seat in the race since Texas Gov. Rick Perry entered and Bachmann won the Ames straw poll three weeks ago.

Stewart said the departures don’t constitute a shake-up but a “restructuring.” Rollins “will now serve as valuable senior adviser,” she said. “We planned to restructure after the straw poll anyway.”

Amy Gardner contributed to this report.

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