Erik ten Hag could face a UEFA investigation after he became the second Premier League manager to fall foul of the organisation's regulations this week.
Article 73.04 of UEFA's Regulations of the Champions League states: 'Press conferences must start between 1200 and 2000 local time. Exceptions to these timings must be agreed in advance with UEFA.'
However, as he prepares to take charge of his first Champions League fixture as Manchester United boss against Bundesliga champions Bayern Munich on Wednesday the Dutchman failed to arrive on time.
The former Ajax boss was 27 minutes late to his press conference scheduled for 7:45pm, crucially making his arrival 12 minutes beyond the deadline set by the governing body.
When the press conference got underway, Ten Hag was accompanied by summer signing Andre Onana and discussed his side's injury concerns, lamenting that they have prevented him from being able to start his ideal XI.
'One thing is true, from the start last season, I almost never started with the best, in my opinion, starting XI,' he said.
'You have to deal with it and we always got the results in, apart from now.'
'That is football and I have the experience from the past, it is always going up. You have to deal with it and I like this situation, as you have to deal with it and manage it. You must focus on the process.'
Ten Hag's violation comes just days after Eddie Howe also fell foul of the rule by starting his press conference prior to Newcastle's draw with AC Milan, at 9pm local time.
The Magpies' boss revealed that his arrival in Italy had been delayed by two-and-a-half hours after their plane was unable to take off due to weather concerns.
He said: 'It's just part and parcel of the job that we do. It's not out of the normal that that can happen. This was a weather problem, but we've been in similar situations.
'It's something we're used to, although it's a slightly later arrival time than we would have liked for the players. It's no big deal though.'
Both bosses are likely to escape with a warning rather than any kind of stringent punishment due to it being a first-time offence.