Jenson Button looks set to start his one-off Formula 1 appearance in 2017 from the back of the grid after being handed a 15-place penalty for Sunday’s Monaco Grand Prix.
Button stepped away from racing full-time in F1 at the end of last year, only to be drafted back in by McLaren for Monaco following Fernando Alonso’s decision to race in the Indianapolis 500.
Button has impressed throughout practice, ending FP3 12th-fastest despite not having driven the McLaren-Honda MCL32 before Thursday.
However, the 2009 world champion’s weekend has now taken a hit after it was confirmed on Saturday morning that he would serve a 15-place grid drop for changes to his power unit after practice.
“We have changed Jenson’s MGU-H/TC after detecting an issue with his MGU-H after FP2,” Honda said.
“The MGU-H/TC will be Jenson’s fifth, which means he will receive 15 place grid penalty for the race.”
Button’s teammate for the weekend, Stoffel Vandoorne, is also due to take a grid drop of three places as a sanction for his clash with Felipe Massa in the Spanish Grand Prix two weeks ago.
Qualifying for the Monaco Grand Prix is live on NBCSN and the NBC Sports app from 8am ET on Saturday.