The 18-year-old becomes Eddie Howe's latest signing, with United obliged to make the move permanent next summer based on performance-related criteria.
Along with his parents Laura and Colin, Hall arrived on Tyneside to complete the formalities of his switch and take a look around the club's training centre as well as St. James' Park - where, he revealed, he enjoyed a stadium tour with his family as a three-year-old.
Hall - who made his Premier League bow for the Blues at St. James' last term - met his new boss Howe and underwent a medical before posing for photos in the shirt he has always wanted to wear.
Serena Taylor was there to capture this behind-the-scenes gallery of Hall's first day in black and white for nufc.co.uk.