Earlier in February, Horner was placed under investigation by the F1 team’s Austrian parent company Red Bull GmbH following an allegation of inappropriate behaviour being made against him by a female colleague.
The external investigation carried out by a specialist barrister, which included an interview with Horner on February 9, is understood to have now been completed.
Horner has denied the allegations throughout the process and was present at reigning constructors’ champions 2024 car launch and pre-season testing in Bahrain last week.
The extensive report, which is thought to run well over 100 pages, is now in the hands of the Red Bull GmbH board, who will ultimately decide whether Horner remains in his dual roles of team principal and chief executive.
A decision was expected to be made and communicated on either Tuesday or Wednesday.
Horner is scheduled to return to Bahrain from the UK on Wednesday.
