While 's current contract runs until the end of 2020, there are performance clauses that could allow him to leave earlier if certain targets are not reached.
The exact details of those performance marks have not been revealed, but it is likely that it relates to Verstappen being in a set position in the drivers' championship by the summer break.
Should that requirement be for third place, then Verstappen is currently in it and 21 points clear of – meaning only a freak set of circumstances would prevent him from being in that slot after this weekend's race in Hungary.
But even if Verstappen may still have a theoretical way out, Horner says that, with the Dutchman taking his second win in Germany last weekend he has no worries about 2020.
That is a much more confident stance than the outfit had prior to Verstappen's win in Austria, when Red Bull's motorsport advisor Helmut Marko confessed to being 'worried' that the youngster would leave.
Christian Horner, Team Principal, Red Bull Racing, Helmut Marko, Consultant, Red Bull Racing, and Max Verstappen, Red Bull Racing, in the garage
Mark Sutton / Sutton Images