Button was already expected to be up against it this weekend, but his task will be even bigger after alterations were made to the MGU-H element and turbocharge of his MCL32.
It is the fifth time engine changes have been made to a car usually driven by Fernando Alonso, who is competing in the Indianapolis 500 this weekend, so a penalty is due to be incurred by 2009 world champion Button.
McLaren racing director Eric Boullier said: “It’s awful for Jenson and awful for McLaren and not expected at all. But it’s Monaco, so we’ll try anything we can.”
Stoffel Vandoorne, Button’s team-mate for the weekend, has already been hit with a three-place grid penalty for causing a collision with Felipe Massa in the Spanish Grand Prix.
McLaren have endured a miserable season, failing to earn a solitary point from five races.
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