Man United striker Wayne Rooney has started insulting the club's Spanish players in their own language, according to Ander Herrera.
In a lengthy interview with El Pais, the former Athletic star joked about focusing on football with Rooney because he doesn't want the boxing enthusiast to get his own back with his fists.
Herrera has started to establish himself in Louis van Gaal's side and also took time to praise fellow Red Devils midfielder Micahel Carrick for the England player's subtle leadership qualities.
Rooney is good fun because he's very open and often insults us in Spanish, but I prefer to talk football with him because he enjoys boxing a lot and I'm not sure if he would try it on me.
Carrick is very serious but he proves another Bielsa saying: 'Leaders don't need to talk much, but they're listened to when they do speak.
As well as fancying himself as a boxer, Wayne Rooney believes he is the finest singer at Manchester United.
Rooney was subjected to an unwanted set of headlines on Sunday after apparently being knocked out by Phil Bardsley during a sparring session in the kitchen of his Cheshire mansion.
Rooney took part in a 'Chevrolet FC hosts Man Utd in Google+ Hangout' on Monday, which was full of light-hearted exchanges and made no mention of his boxing.
When Rooney, who was sitting between Michael Carrick and Ander Herrera and apparently at Old Trafford, was asked who the best singer is at the club, he replied: "Probably me.
"Over Christmas a few of the players got up and did a few songs. Quite good some of them. Michael's not bad."
Herrera said of Carrick: "He's humble, but he's the best."
The host then asked Rooney what songs he liked to sing.
"Opera," Rooney said, before adding: "Only joking. I like to sing a bit of indie rock."
Wayne Rooney poked fun at himself by falling over as if on the end of a knockout blow after scoring in Man Utd's 3-0 win over Spurs, then said he had no idea how a video taken in his home had found its way to the front pages.
The clip emerged earlier on Sunday showing the England captain being apparently knocked out in his kitchen by former Man Utd team-mate Phil Bardsley during a sparring session.
"That's the world we live in today. It was a few mates in a private house, which has somehow managed to go front page of a national newspaper… it was me and a few friends joking about," Rooney told Sky Sports.
Wayne Rooney and Manchester United finally delivered a knockout performance as sorry Spurs were blown away at Old TraffordRead the full story ›
Wayne Rooney poked fun at himself as he celebrated scoring against Tottenham by throwing a flurry of air punches and falling backwards as if on the end of a knock-out blow.
Video had earlier emerged of the Manchester United and England striker being apparently knocked out in his kitchen by former team-mate Phil Bardsley during a boxing sparring session.
The Twittersphere reacted quickly to a story claiming that England and Man Utd skipper Wayne Rooney was knocked out in his own kitchen during a sparring session with former United team-mate Phil Bardsley.
Here are a few of the best tweets about the alleged incident:
That Rooney video pretty much sums up United's season. Thinking you're better than everyone else and then getting knocked out by Stoke
Big congratulations to Phil Bardsley on winning the WBA regular world title ?
Rooney is clearly no Clarkson.
Just saw the Wayne Rooney boxing vine. Phil Bardsley put him down with a jab. Must have been a dive.
"It's not a dive for me, I think Rooney was just taking evasive action there," said Hodgson. #WayneRooneyKO
Wayne Rooney's got a worse chin than Amir Khan.
Always wondered who would win in a fight between Phil Bardsley and Wayne Rooney. Now we know.
A video has been released which appears to show England captain Wayne Rooney being knocked out by his former team-mate Phil Bardsley in a sparring session in his kitchen.
The Sun claims the footage (subscription required) was shot in Rooney's kitchen on February 22, one day after Manchester United's 2-1 Premier League defeat to Swansea.
In the video, the two former team-mates pull on boxing gloves and trade blows as they spar in Rooney's Cheshire mansion.
Stoke defender Bardsley then catches Rooney square in the face with a left jab, sending the United and England skipper plummeting to the floor.
Rooney lays prostrate on the floor and the video comes to an abrupt end. He is due to lead United out at Old Trafford this afternoon for their Premier League match against Tottenham.
Neither the club nor Rooney's representatives have commented at this stage, although the player's love of boxing is well-known.
Preston goalkeeper Thorsten Stuckmann says Wayne Rooney apologised after the Manchester United striker won a debatable penalty in their FA Cup tie.
Rooney was accused of diving after winning the penalty, which saw him hurdle the goalkeeper, but make no contact.
"After the game Rooney told me: 'Sorry, it was my chance to get a penalty. I had to use that'," Stuckmann is quoted as saying in The Sun.
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Louis van Gaal believes Man United play better when Wayne Rooney is deployed in midfield.
A rocky week for Van Gaal continued on Wednesday night as his United team had to battle their way to an unconvincing 3-1 Premier League win over Burnley.
United were slow and lacked creativity in attack but Van Gaal doesn't believe the answer to his team's problems can be resolved by pushing Rooney further up field.
I have to look for the better balance and I think until now because of Rooney we have a better balance in midfield.
I was very pleased how he replaced Daley Blind in the number six position. He showed composure and of course he was also today the Rooney that I want to see but he has showed that he can play in every position.
Maybe he can better play in a striker's position but then I have a problem in midfield.