"It is almost an annual thing that there is speculation about his future," the Milton Keynes based team' boss is quoted saying by British magazine Autosport.
"But he has always made it clear his feeling towards the team, the paternal feeling he has for Red Bull," added the Brit.
So Horner is confident Newey will stay put at Red Bull.
"He enjoys the environment that he is working in, so I think the speculation is purely that."
Horner is also confident his star driver Sebastian Vettel is back to his usual self, after a couple of disappointing performances, as the championship heads to Monaco.
"I think [in Barcelona], you could see in the race the recovery drive that he had, with the fastest lap and the way he hunted down the Ferraris it looked like he got his mojo back," Crash.net quotes hims as saying.