With Red Bull Racing taking control of the Honda power units for 2022 and beyond, it has opened the possibility that the Milton-Keynes based team could supply other teams in the future. If a team requires a power unit, Red Bull may be impelled to provide one.
"Yes by taking on the obligations of an engine manufacturer, you're bound by your obligations to supply so that would be no different to any other manufacturer," Horner said to selected media.
When it comes to naming rights on the engine, the Red Bull team principal has said that it will be a Red Bull engine when Honda exit at the end of the season.
"As far as the badging is concerned, there's no discussions underway regarding that so it will be a Red Bull engine," said Horner. ''Mercedes is a Mercedes it will be an incorporated part of the car, so it'll just be a Red Bull.
Horner also confirmed that it will be a completely normal campaign with Honda until the 31st of December.
"Honda are continuing to operate as usual this year," said Horner.
"They'll stay committed to the sport till the 31st of December during which time they'll obviously be working with fuel partner Exxon Mobil which they're currently doing with the development of the E 10 fuel, which is obviously the biggest regulation change into next year.
"So it's business as usual very much for the 2021 year."
According to Motorsport.com, both Ferrari and Red Bull had gone into last week’s meeting hopeful that there would be a system where a manufacturer would be allowed to rectify their power unit if it was markedly adrift of the others.
Despite what looked like a new regulation announced last week between the teams that engines would be frozen from 2022 onwards, Horner admitted that if one of the engine manufacturers was a long way behind the others like Ferrari were in 2020, an agreement is in place that would allow the FIA to address it.
"Whilst there isn't anything within the regulations, there is an agreement between the manufacturers that each have supported to the FIA to address it, in the event that a manufacturer is out of kilter," said Horner.
"So there is effectively an undertaking by each of the manufacturers to address it should it arise, whilst it's not within the regulations."
"It gives the FIA the necessary empowerment to bring the parties to the table. That's important, and there is a clear understanding, particularly from within the top level of each of the OEMs."