Mercedes Team Principal Toto Wolff says there is a "zero chance" that there will be any further changes made to the Formula 1 2026 engine regulations.
New regulations will be adopted as part of F1's increased focus on sustainability with the use of synthetic fuels being more prominent and a removal of the costly MGU-H element of the power unit.
Several other Team Principals have shared concerns over the impact the new regulations will have on the chassis, with Christian Horner claiming F1 will become a "Frankenstein formula."
But Wolff is certain that any 11th hour changes are unlikely.
"That's not going to happen. Zero chance. Capital letters. So I don't know why these things are coming up," he said when speaking to media, including RacingNews365.
"We've developed those regulations over many years, with all the auto manufacturers being involved."
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Wolff: Compromises attracted Audi to join and Honda to stay
Prior to the new engine regulations being finalised, both Audi and Honda expressed interest if certain changes were made to make it more accessible and less costly.
These changes to the current power unit architecture enabled both to enter as makers from 2026, while Red Bull will also launch their own operation in conjunction with Ford.
Wolff believes these changes were integral to ensuring the commitment from some of the worlds biggest automakers.
"It was a compromise that attracted Audi to finally join the sport and for Honda to stay in there, so this is the best possible case that one could imagine for Formula 1," he added.
"Is it challenging when designing our chassis and saying 'How are we going to do this here?'
"But zero [chance]. These regulations are not going to change anymore.
"They're not going to be postponed anymore, because the world needs to show innovation around sustainability. We need to reduce emissions and we're super excited."