A new biography about Manchester United manager Louis Van Gaal claims that the Dutchman often humiliates his wife Truus in public.

O, Louis: In Search of Louis van Gaal by Hugo Borst, which is being serialised in The Times also claims that alcohol does not have a "favourable effect" on the former Barcelona, Netherlands and Ajax coach.

In one extract, Borst says of Van Gaal's relationship with his spouse:

"Having spoken to at least half a dozen people off the record, all of whom furnished me with a detailed account of these excruciating scenes, I know all I need to know.

"The common thread running through all these accounts is humiliation. In the company of friends and acquaintances, Louis has made comments that in nine out of ten marriages would have been grounds for divorce."

Borst tries to show that in the following passage:

"We drink the wine that Louis van Gaal has selected for us. "Good, eh?" he says and fires me a penetrating look. "Or don’t you think so? Well?"

"Absolutely. Really nice, Louis."

Since his stint at Barcelona, he has developed a nose for wine and he likes to have this confirmed.

"Louis always chooses wonderful wines," says Truus.

"That’s very true,” says Van Gaal.

"That other one is really lovely too," Truus adds.

"What do you mean that other one?" Van Gaal shoots back. "That’s no good to anyone, Truus. When are you going to learn? You’ve got to name names. There are wines by the thousand. Was it white or red?"

"Never mind,” she says and raises her glass.

"Am I right or not? Well, Truus?"

"I’ve forgotten what it was called," she sighs. "Just leave it, will you?"