Whites boss Daniel Farke gave a debut to new summer signing Ethan Ampadu who started in centre midfield and the 22-year-old made a good impression as the first half ended 0-0, Leeds guilty of squandering chances in front of goal.
Leeds again pushed forward after the break but a period of strong pressure from Monaco led to the French side going ahead through a Wissam Ben Yedder penalty awarded for Willy Gnonto dangling a leg as Leeds looked to clear a corner.
The second half also featured a Whites return for Sam Byram who has been training with Leeds and was brought on as a second half substitute but Monaco bagged a second goal through a fantastic bullet header finish from Kevin Holland from a left flank cross.
Graham Smyth, the YEP’s chief football writer, hands out the scores from Saturday’s pre-season friendly at the LNER Community Stadium in York.
13. Charlie Cresswell (sub)
6 - Took a couple of risks with challenges or headers. Didn't quite settle as he'd have liked. Photo: Alex Davidson
14. Willy Gnonto (sub)
7 - Lively, drew fouls all over the pitch, found space and operated cleverly in tight areas. Photo: Matt McNulty
15. Joe Gelhardt (sub)
7 - Some examples of his major strengths, turning away from players and driving goalward. Played a couple of nice balls too. Photo: GEOFF CADDICK
16. Cody Drameh (sub)
6 - Solid enough, didn't do much wrong but didn't have a huge impact either. Photo: Ash Donelon
17. Darko Gyabi (sub)
6 - Couldn't properly assert himself in the middle and didn't get his passing going like he can. Photo: Warren Little
18. Jamie Shackleton (sub)
6 - Neat, tidy, industrious but the last part, the technical part and the passing, wasn't quite there. Photo: Matthew Peters