Last month, Horner was the subject of an internal investigation into his conduct following accusations of alleged 'inappropriate behaviour', allegations which he vehemently denies and was cleared of any wrongdoing by the wider Red Bull brand.
However, documents allegedly showing supposed WhatsApp messages sent by Horner were anonymously leaked during the Bahrain GP weekend, bringing the issue right to the top of the agenda once more.
While rumours of infighting within the team have come to light, it has been reported that 'clear-the-air' talks have been held with personnel close to the Verstappen family.
Despite this, Berger believes that the rumoured switch for three-time world champion Verstappen to Mercedes is a real possibility, as is the departure of key figures in the Milton Keynes-based outfit's squad, Helmut Marko and Adrian Newey.
“As of now: Horner stays, Helmut Marko and Adrian Newey quit and Max goes to Mercedes,” Berger told F1 Insider.