Among the issues being raised privately among some players are Ten Hag's intense training sessions since the preseason tour of the United States, and what are considered to be cavalier tactics which have left the team open, particularly during the 3-3 draw against Galatasaray and the defeat at Newcastle.

Ten Hag, according to a source, has tried to cool the atmosphere within the squad by backing his players in public despite some poor individual performances.

According to a source, there is a feeling held by some members of staff that certain players do not respond well to criticism, particularly comments made in public.

Off the field, a source has told ESPN that Sir Jim Ratcliffe's proposed investment is unlikely to be confirmed this week.

Ratcliffe and INEOS, his chemical company, are set to buy a 25% stake in the club while also taking influence over the sporting side of the business.

Sources have told ESPN that there's growing frustration at the time it's taking for Ratcliffe's investment to be confirmed and the uncertainty it's causing around the futures of staff currently at the centre of the football department.

Meanwhile, a source has told ESPN that United were upset with referee Robert Jones' decision not to send off Fabian Schär during the defeat to Newcastle.

Ten Hag and captain Bruno Fernandes, according to a source, visited Jones in his room after the game to ask for an explanation following a challenge on Fernandes by Schär in the second half.