Both have joined on a season-long loan deal as the bantams continue their rebuilding job under new head coach Michael Collins.
Miller spent the second half of last season on loan at Bury, where he netted eight goals in 19 games. He had earlier started his career at Gigg Lane before moving to Boro a year ago. His arrival comes amid huge uncertainty surrounding Bantams striker Charlie Wyke.
Last season’s top scorer has been the subject of bids from Sunderland and Peterborough United, while another unnamed Championship club is understood to be keeping a close eye on proceedings.