Manchester United boss Erik ten Hag is said to be "furious" with their market work.
The Mirror says 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.
United have been able to sign full-back Tyrell Malacia, midfielder Christian Eriksen and centre-back Lisandro Martinez, but the club have struggled to land other targets.
It is believed that Ten Hag was promised that the club would bring in five new players this summer but they are running out of time before the transfer window shuts on September 1.
United have now been linked with Stuttgart's Austrian striker Sasa Kalajdzic, although he is way down Ten Hag's list of targets.