Verstappen and Lambiase raised eyebrows with a vocal disagreement over their run plan during Friday qualifying for last week's Belgian Grand Prix.
That was followed up by more fiery exchanges in the race, particularly when Lambiase asked his driver to "use your head more" in the final stint when Verstappen took too much life out of his new soft tyres.
Verstappen then joked that he would push on and make another pitstop for some "pitstop training", which his engineer quickly shot down.
When asked about the episode, Horner praised Lambiase for having a strong character to deal with a "demanding customer" in Verstappen, jokingly likening Lambiase to square-jawed Hollywood action hero Jason Statham.
"I think to race engineer Max Verstappen you've got to have strength of character, because he is one tough customer," Horner said.
"Many race engineers would crumble under that pressure and GP has got the strength of character to deal with that.
"GP is our Jason Statham equivalent, I guess, they certainly look alike...! He deals with him firmly but fairly and there's a great respect between the two of them.
"The only problem is that conversation between the two of them, 200 million people are listening to. But there's a great bond and a great trust between the two. There's no counselling required."
Source: Autosport