Red Bull are investigating a complaint against their Formula One team boss Christian Horner, the Austrian energy drink company said in a statement on Monday without giving any details about the allegations.
The Briton presided over the most dominant season in Formula One history last year, with Max Verstappen taking his third title in a row and the team winning 21 of 22 races.
"After being made aware of certain recent allegations, the company launched an independent investigation," Red Bull said.
"This process, which is already under way, is being carried out by an external specialist barrister. The company takes these matters extremely seriously and the investigation will be completed as soon as practically possible.
"It would not be appropriate to comment further at this time."
The Times newspaper reported Horner, 50, had been accused of inappropriate behaviour by a female colleague, who complained to the team's parent company.
There was no comment from the team but Horner, who is married to former Spice Girls singer Geri Halliwell, told Dutch newspaper De Telegraaf that he completely denied the allegations.
Kazakhstan's Elena Rybakina secured the last qualifying spot for the season-ending WTA Finals in Riyadh after advancing to the Pan Pacific Open semi-finals in Tokyo on Friday.
Chauncey Billups, an NBA Hall of Fame player and head coach of the Portland Trail Blazers, and Terry Rozier, a guard with the Miami Heat, were among more than 30 people charged on Thursday in connection with two separate but related federal gambling investigations that involved the league and the Mafia.
Formula One's governing body has defended the quiet reinstatement to its World Motor Sport Council of a Russian member subject to international sanctions as a result of the war in Ukraine.
Lionel Messi has extended his contract with MLS side Inter Miami to 2028, the club announced on Thursday, a boost for the North American league as the Argentine great keeps his career going.
Australia all-rounders Matt Short and Cooper Connolly scored half-centuries as the hosts claimed a two-wicket victory over India at Adelaide Oval to seal their one-day international series with a match to spare.