Sacko joined the Whites on loan from Sporting Lisbon last week.
Sacko joined Monk's revolution at Elland Road last week when he signed on a season-long loan deal from Sporting Lisbon, and he is one of six new faces to arrive at the club already.
Veteran goalkeeper Robert Green, defender Kyle Bartley, midfielders Kemar Roofe and Matt Grimes, and striker Marcus Antonsson have all also been brought in by Monk as he looks to shape his own squad.
Sacko caught the eye of the Whites boss with his excellent form for the Sporting Lisbon B team, and also impressed during a loan spell at French side Sochaux last season.
He has now linked up with his new teammates, and shared a photo of himself in training with the squad on Sunday afternoon.
The winger looks an exciting addition to the Leeds squad, bringing pace and power and the ability to play both centrally and out wide in an attacking role.
Whites supporters will be looking forward to seeing the 22-year-old in action, and will be hoping that he can take the Championship by storm as the Yorkshire side aspire to put together a play-off push this season.