Leclerc sat in the Scuderia garage as times tumbled at the end of Q1 and he was ultimately eliminated by team-mate Sebastian Vettel, himself scrambling through after an error early in the session.
Starting 15th on the grid, Leclerc pulled off some impressive early overtakes, but came a cropper when trying to pass Nico Hulkenberg at La Rascasse, extending his run of home-race DNFs to four from as many outings.
Hamilton took pole in Monaco and said of Ferrari's quali error: "Sometimes it happens, y'know? They'll have a minimum time, the knock-out time.
"They'll say the least time is this, and they'll predict that the track is going to improve a certain amount.
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