The pair are among the 22 selected for the matches against Kazakhstan and Bosnia-Herzegovina in the upcoming international break.
Holgate has broken into the Blues' first-team this season, with some impressive displays at right back deputising for Seamus Coleman.
Galloway, meanwhile, is on loan at West Bromwich Albion after struggling to get back into the senior side last season once Leighton Baines had returned from injury.
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