Verstappen won his eighth consecutive race before the summer break at Spa, which extended Red Bull's clean sweep of winning all of 2023's 12 races so far, an all-time record.
Red Bull has now bagged the past 13 grands prix, a record that would have extended to 23 had it not lost out to George Russell and Mercedes in last year's Brazilian Grand Prix.
But despite the team's unprecedented dominance with its all-conquering RB19, team principal Horner refuted any concerns over the Milton Keynes squad resting on its laurels.
"I don't think so. I think we’re very much taking it one race at a time, one session at a time," Horner said. "And I think you have to focus like that.
"Nobody's allowing their mind to drift and I think that it’s a long, long championship.
"There’s a lot going on behind the scenes with Red Bull Powertrains, as that's gearing up as well in the background in Milton Keynes, with 2026 not being all that far away now. So, plenty to keep people focused on."
Red Bull has received "numerous approaches" from rival teams to poach its best staff, with Rob Marshall one key figure heading to McLaren, although it has equally headhunted hordes of engineers to set up its new engine division.
Source: Autosport