Notorious for his stringent critique and decisive driver dismissals, Marko's managerial style came to the forefront with Nyck de Vries' abrupt departure from the AlphaTauri junior team last season.
Former driver Daniil Kvyat has also spoken out about his experiences with Marko.
Red Bull completely dominated in 2023 and cruised to their sixth constructors’ championship and Verstappen’s third consecutive title, but Bird has indicated that Marko is not happy in his role with the team.
Speaking on the Chequered Flag podcast, the Formula E driver also suggesting that the Austrian and team principal Christian Horner have fallen out.
“I mean, I’ve heard that Helmut Marko is contractually with Red Bull, but am I right in saying that that contract is [until] the end of the year?” he said.
“He’s not happy about that. That’s what I’ve heard, that has really upset him that that was up after one year and him and Christian [Horner] are really clashing now is what I’ve heard.
“He doesn’t have an ally in Christian anymore and Christian certainly doesn’t have an ally in him.”
Horner is currently the subject of an internal investigation by Red Bull over alleged 'inappropriate behaviour' towards a female colleague.
The 50-year-old completely denies the allegations and the investigations could meet its conclusion as early as next week.