Louis van Gaal has told his players they must only speak to each other in English, Juan Mata has revealed.
Van Gaal has laid down a few rules since taking over at Manchester United.
The Dutchman has reminded his players they must fulfil their media duties and has told the United board that next year's pre-season tour must be shorter.
And now it has emerged that Van Gaal has instructed his squad to speak to one another in English, presumably to improve unity in the ranks.
"We (the squad) only speak in English," Mata said.
"He (Van Gaal) says we have to speak in English."
Mata, who is perfectly fluent in English having arrived in the UK three years ago, does not see the new rule, or any other laid down by the new manager, as harsh.
Manchester United: Potential summer transfer targets
Manchester United: Potential summer transfer targets
1/19 Arturo Vidal
The Juventus midfielder is among United's top targets this summer, particularly after impressing for Chile at the World Cup. Having helped his current team secure the Serie A title, Juventus aren't keen on letting him go.
2/19 Marco Reus
Rumoured to be near the top of United's target list, a possible swap deal involving cash and Shinji Kagawa has been mentioned. The Borussia Dortmund player would not be a cheap acquisition, especially given his recent declaration that he wants to stay at Dortmund next season
3/19 Arda Turan
Former manager David Moyes had been seen watching Turan, though his dismissal put a doubt over whether United were still interested. The winger's agent claims an offer has been made, so is the Atletico Madrid winger on his way to Old Trafford?
4/19 Arjen Robben
The Bayern Munich winger has said Van Gaal has offered him a place at Old Trafford if he wants it. Currently he's happy to stay where he is, but things can quickly change.
5/19 Claudio Marchisio
With Paul Pogba highly unlikely to be prised away from Juventus, United's attention could turn to team-mate Claudio Marchisio. The Italian international would provide some class and experience.
6/19 Mats Hummels
With defensive reinforcements high on United's list of priorities, Borussia Dortmund's Mats Hummels has unsurprisingly been linked with a move to Old Trafford. The German has been earmarked as the ideal replacement for the now-departed Rio Ferdinand and after his impressive showing at the World Cup, he's even more desirable.
7/19 Raphael Varane
Raphael Varane has already snubbed United once in his career, opting instead to join Real Madrid. It would surely take a big offer to prise the classy defender away now.
8/19 Seamus Coleman
Reportedly already the subject of a £15m bid, Seamus Coleman could be the man being lined up as the answer to United's problems at right-back.
9/19 William Carvalho
The Sporting Lisbon midfielder has reportedly been watched 15 times by Manchester United, although the £29m asking price could prove a stumbling block. The Portugal international has also been linked with Arsenal.
10/19 Xherdan Shaqiri
Bayern Munich winger Xherdan Shaqiri has struggled to force his way into the first team at the Allianz Arena and could be a target for United as well as rivals Liverpool. His impressive displays for Switzerland this summer could make it harder to prise him away.
11/19 Alex Song
Barcelona are understood to be ready to let the former Arsenal player leave this summer. Could provide some strength to United's midfield. Could also bring embarrassment judging by his behaviour at the World Cup.
12/19 Fabio Coentrao
Supposedly came within hours of signing in January, the Portuguese left back could be brought in to provide back-up to Luke Shaw.
13/19 Julian Draxler
A long time Arsenal target, United are reportedly interested in pinching the young German with a bumper offer. Seems unlikely though. Arsenal also strongly interested.
14/19 Sami Khedira
The Germany international is reportedly being pursued by a host of sides, and United might be wise to get in the mix as they look to add some quality to a fairly feeble looking midfield. Real Madrid appear open to letting him go with the 27-year-old having just one year left on his contract. Arsenal and Chelsea are among the others keen on signing the World Cup winner.
15/19 Edinson Cavani
The Uruguayan hitman would prove pricey and tricky to snatch away from PSG and it seems unlikely United have enough to offer him.
16/19 Luciano Vietto
The Racing Club youngster has been impressing in Argentina for some time although a move directly to United would be something of a surprise.
17/19 Santiago Arias
Should a move for Seamus Coleman fail, PSV defender Arias is reportedly being lined up by United. Played for Colombia throughout the group stage of the World Cup.
18/19 Miralem Pjanic
Rumoured to part of a joint bid including teammate Benatia, the Bosnian midfielder is reportedly another on United's large hit list.
19/19 Kevin Strootman
Van Gaal knows Strootman well from working with him in the Netherlands set-up and has indicated he is interested. Roma are reluctant to sell whilst his recovery from a knee injury may prove a stumbling block.
In fact, the Spaniard has a deep respect for his new club manager, and is fully behind everything he is doing at Old Trafford.
"He is very good on and off the pitch. He is a good man and a great manager," Mata said.
"He has a lot of experience, he has won trophies in previous teams too, so it's a good chance for me to learn from him and for us to improve as a team.
"He is demanding. He is very honest, straight, speaks with everyone to his face. I think this is good, a perfect way to do it, saying what you think about the players in front of them."
Mata's respect for his new manager increased six weeks ago when he witnessed at first hand Van Gaal's Holland hammer Spain 5-1 in the World Cup.
"That game was very, very bad for us," said Mata, who watched on from the bench.
"They scored five goals against Spain so he did a great job."
Van Gaal plans to implement the 3-5-2 formation he used in the latter stages of the World Cup at United this season.
That is good news for Mata, who is the perfect candidate to play in the hole behind two strikers.
Mata enjoyed two successful years at Chelsea in that position, winning the club's player of the year award on both occasions.
But under David Moyes, Mata was often stationed on the right wing, where he did not look comfortable at all.
The former Valencia midfielder hopes Van Gaal's new system will bring the best out of him.
"If I play behind the two strikers it's a good position (for me)," he said.
"I can look for the ball, I can try to assist or score, so I will try my best.
"I will try to score as much as I can and try to help the team from that position.
"If I have to play on the wing I will try my best as well but I feel comfortable in this role."
United have adapted to the new formation straight away, beating the Los Angeles Galaxy 7-0 in Van Gaal's first game in charge on Wednesday night.
And Mata hopes the system will be just as effective in the Premier League.
"It can be very dangerous for the opponent. It is difficult for them to play against us in this formation," he said.
Finishing seventh last year is an experience Mata will never forget, even though he was only at the club for the last four months of the season.
The Spaniard is aiming for the highest finish possible this term.
"Last season was my first season in England without trophies so hopefully this new season I will be back to win something," said Mata, who will play against his former club Valencia at Old Trafford on August 12.
"The Premier League is a trophy I have never won so it would be a dream for me.
"Ever since I was young Manchester United was winning trophies or fighting for them so that is what we have to do.
"We have great players, a great manager. We have to go step by step but Man United always play for winning."
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