The Pirates reassigned McGuire to minor-league camp Monday.
He's expected to serve as the full-time starter for Double-A Altoona. McGuire, who went 1-for-10 in Grapefruit League action, remains the organization's top catching prospect. His defense is already major-league ready, but he's a work in progress, offensively. McGuire batted .254/.301/.294 in 374 at-bats for High-A Bradenton in 2015.