The two are said to have been feuding since the start of the season as a result of the accusations against Horner of alleged ‘inappropriate behaviour’ towards a female colleague.
Jos Verstappen: I'm completely finished with Horner
The latest feud between Horner and Jos Verstappen came at the Austrian Grand Prix, when the latter was due to take part in the Red Bull Legends Parade.
The event showcases historic cars doing laps around the Red Bull Ring, and the 52-year-old was set to drive the RB8 from 2012, which led Sebastian Vettel to his third consecutive world title at the expense of Fernando Alonso.
However, the former F1 driver has claimed that he was blocked by Horner from taking part in the event, and he subsequently withdrew from the Legends Parade, hitting out at the team principal in the process.
"There was going to be filming, for example also with a drone, but Horner didn't want me to be filmed.
"I'm completely finished with Horner. It's like a kindergarten here. I would have been allowed to ride in the end, but I backed out. I find this so childish of Horner, but I think it says something about him."