Aston Martin's Sebastian Vettel will take a grid penalty at the U.S. Grand Prix after exceeding his engine allocation for the season.
The four-times Formula One world champion, a winner at Austin's Circuit of the Americas with Red Bull in 2013, has been struggling to score points recently with only one top-10 result in the last nine races.
"I think we are heading into, let’s say, a difficult weekend," the German told reporters. "We are changing the engine and therefore we will have a penalty.
"We will see what we can do from where we start, and nevertheless, looking forward I think we can be strong here. How strong? We will see."
Drivers are allowed three engines to last the season and any more than that triggers a grid drop. How many places depends on how many components of the power unit are changed.
Aston Martin use the same engines as champions Mercedes, whose seven-times world champion Lewis Hamilton took a 10-place grid drop for the same reason at the previous race in Turkey.
The Circuit of the Americas offers at least plenty of overtaking opportunities.
"I think it's a good place to do it (take the penalty) and hopefully we'll have an entertaining Sunday afternoon and get back in the mix," said Vettel.