Erik ten Hag is reportedly furious with how Manchester United have conducted their summer transfer business.
It has been a disastrous start to the Dutchman's helm at the club both on and off the field, with their lack of signings on top of the club being bottom of the Premier League after his opening two games.
The Mirror have reported that Ten Hag and his advisors are furious with how he has been let down in the transfer market, as well as the saga surrounding Cristiano Ronaldo's future at the club which has proved an unwelcome distraction.
Manchester United have been able to sign full-back Tyrell Malacia, midfielder Christian Eriksen and centre-back Lisandro Martinez - though the club have struggled to land other targets.
Barcelona midfield playmaker Frenkie de Jong has been their main target this summer, though they could be set to miss out on the Netherlands international to Premier League rivals Chelsea.
It's said that Ten Hag was promised that the club would bring in five new players this summer - meaning they are running out of time before the transfer window shuts on September 1.
The Mirror claim that United have now been linked with Stuttgart's Austrian striker Sasa Kalajdzic - though he is way down Ten Hag's list of targets.
The 25-year-old has scored 24 goals and provided ten assists in his 55 games for the German side.
Meanwhile, Ronaldo's future at the club has been a distraction after he expressed his desire to leave earlier this summer.
The Portuguese superstar wanted to depart Old Trafford after they failed to qualify for the Champions League, however, he is likely to stay with a lack of viable clubs who can, or want to sign him.
Ronaldo made his first start on Saturday against Brentford, after missing the majority of pre-season.
United produced a woeful display as they were comfortably thrashed 4-0 by Brentford, leaving them bottom of the table for the first time since 1992.
Other players United have been linked to have not been warmed to by fans.
A move for Bologna's Marko Arnautovic was put to an end by fan backlash, while fans have not warmed to the idea of signing Adrien Rabiot - a move which has stalled over salary negotiations.
United's season could get worse before it gets any better as they next play Liverpool at Old Trafford on August 22.
Frustration over the club's lack of signings has led to more fan backlash against the Glazers, with more protests expected against the American owners before they play Jurgen Klopp's side.