After negotiating an early release from his contract, Newey will leave the world champions at the start of next year, and is free to join a rival team.
Many were shocked by the news that the former team boss was now managing Newey, with Horner labelling Jordan as the mastermind behind his exit from the team.
“Christian, do you know what he called me – do you know what he called me when he found this,” Jordan said to David Coulthard on their Formula For Success podcast.
“First of all, his jaw was somewhere around near the end of his trousers. It’s quite a big jaw in the first place. But he called me ‘Ah, EJ, you’re a f****** silent assassin.
“I don’t know what a silent assassin is. Maybe you could tell us, DC, what is that?”
In reply, Coulthard referenced everyone’s shock at Jordan being Newey’s manager, and elaborated on what Horner could have meant.
“You’d rather be a silent assassin than somebody hearing you coming. No-one saw that coming at all. Nobody knew you were managing Adrian,” Coulthard replied.