Though under contract until 2028, rumours have been circulating that Verstappen may have an exit clause included in his contract, which could be triggered by the departure of Newey.
Horner, however, has shot down those claims, and is confident that his star driver will remain a pivotal part of the team in the post-Newey era.
Speaking to Sky Sports at the Miami GP, the 50-year-old said: “I think Max’s contract is always going to remain confidential but there’s no clauses that link Adrian in any way to Max.
"They’ve enjoyed a good relationship over the years, as have our previous drivers, but Max as well understands there’s been a planning process to this and it’s not just a knee-jerk [reaction].
"The structure will not change with Adrian stepping back.”
Verstappen is, however, believed to have a clause in his Red Bull contract that would allow him to leave the team if great friend and advisor Helmut Marko departs the Milton Keynes squad, as was largely expected to happen earlier this season.