Manchester United's players and staff have been unnerved by manager Jose Mourinho's dark moods this preseason.

The Daily Mail says Mourinho's extraordinary outburst at the weekend continued to reverberate around the United camp in Miami on Monday.

It is understood that his comments about wanting Anthony Martial back in America following the birth of his baby boy caused particular concern among club officials.

"Jose's mood is dragging the whole tour down," a source claimed.

"He's clearly not happy with Ed Woodward and everyone else is suffering because of it."

Another claimed that some players are finding his behaviour "exhausting".

Some players are also said to have been shocked by what Mourinho said about the depleted squad available to him, and the fact he singled out Martial and Antonio Valencia for special criticism.