Manchester United boss Erik ten Hag added four new youngsters to training on Thursday.
Leeds held Man Utd to a 2-2 draw at Old Trafford on Wednesday - but Ten Hag's men won't be too keen to drop points again.
They'll have to see off the relegation-threatened Leeds this weekend without a number of key players.
Midfield enforcer Casemiro is still serving a three-game suspension after being sent off in the 2-1 win over Crystal Palace.
And first-team midfielders Christian Eriksen, Donny van de Beek and Scott McTominay are all nursing injuries.
The arrival of Marcel Sabitzer has, however, handed Ten Hag a huge boost in the midfield department.
Nonetheless, Ten Hag decided to hand four little-known Red Devils youngsters the chance to impress in first-team training.
Bjorn Hardley, Mateo Mejia, Noam Emeran and Sam Murray were all snapped training alongside Man Utd first-team regulars.
All of the players involved have impressed for the youth sides so far this term.