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.
19. Mateo Joseph (sub)
6 - Wanted the ball, tried to get at players, made some clever runs but couldn't get on top of the defence. Photo: Naomi Baker
20. Sam Byram (sub)
6 - Tidy without ever really threatening on the left. Didn't come under much pressure defensively. Photo: Rob Munro