Gabriel, who won both the Premier League and United's Under-18 player of the season awards last term despite only turning 14 as the campaign began, remains the only change to the group beaten 1-0 by Wrexham in Finland last week, with striker Ethan Wheatley the man to make way.
The teenager, who doesn't turn 16 until October, has been tipped for involvement in pre-season for some time given his rapid progress through United's academy system, and a first senior appearance in Norway would mark the latest landmark in an already eye-catching rise.
His inclusion means there is still no place in the squad for £8m signing Tynan Thompson, the 18-year-old winger recently recruited from Tottenham. Striker Benjamin Sesko, goalkeeper Karl Darlow and defender Matthijs de Ligt all remain unavailable through injury.
Gabriel's rise through United's academy has been rapid even by the standards of the club's recent crop of young talent, with the winger already drawing comparisons to some of the country's most exciting emerging prospects after his standout campaign with the Under-18s.
Carrick has spoken previously of his willingness to promote academy players when they are ready, and Gabriel's inclusion in the squad for Trondheim suggests the head coach believes the teenager's development has reached a point where senior involvement, even at this early stage of pre-season, is a natural next step. Should he feature against Rosenborg, it would rank among the youngest first-team appearances in the club's modern history.
Manchester United's travelling squad for Trondheim: Tom Heaton, Radek Vitek, Harry Maguire, Leny Yoro, Luke Shaw, Ayden Heaven, Mason Mount, Joshua Zirkzee, Patrick Dorgu, Andrey Santos, Bryan Mbeumo, Chido Obi, Jack Fletcher, Tyler Fletcher, Harry Amass, Toby Collyer, Dan Gore, Dermot Mee, Shea Lacey, Ethan Williams, Jaydan Kamason, Jacob Devaney, Jim Thwaites, Dan Armer, JJ Gabriel.