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.
7. Archie Gray
7 - Very bright in the first half. Showed his quick feet, linked up with Sinisterra well. Didn't shy away in the tackle. Photo: LUFC
8. Luis Sinisterra
7 - Took up clever positions to find space, linked up well, got himself into the area and delivered dangerously a few times. Photo: OLI SCARFF
9. Dan James
6 - Got into some good positions and his pace helped. Delivered one dangerous low cross but end product wasn't always so evident. Photo: LUFC
10. Crysencio Summerville
6 - Some flashes of his ball carrying ability, a few nice turns but couldn't turn it into much else. Photo: Stu Forster
11. Georginio Rutter
7 - Some really nice football when he got the chance. Showed his ability to look after the ball. Also showed that he'll try things that aren't always on. Photo: Matthew Peters
12. Patrick Bamford (sub)
6 - Had a single chance and couldn't take it. Struggled to get into the game in a half when Leeds weren't as good on the ball. Photo: Julian Finney