'She's hard work': Who was Tom Brady referring to in angry phone call on day of ... trends now

Mystery remains over who Tom Brady was speaking to during a furious phone call in which he is thought to have yelled 'stop calling me' on Wednesday.

Just hours after announcing his retirement from the Tampa Bay Buccaneers, Brady was caught on camera lashing out at somebody over the phone appearing to say 'she's hard work,' and also 'this has gotta stop.' 

Suspicions were raised he could have been speaking about ex-wife Gisele Bundchen, with whom he divorced in October after 13 years together.

And the timing of the furious phone call suggests it could have had something to do with Brady's decision to retire, having done the same thing last year before sensationally 'unretiring' two months later. 

Lip-reading experts have transcribed Brady's conversation for Dailymail.com.

Jeremy Freeman, who is certified by the Deafness Cognition and Language Research Centre at University College London , said Brady initially says 'stop calling me.' 

He is then seen angrily saying, 'you say that today and that's stupid' as he tries to explain something pertaining to his retirement. 

He adds: 'I've advised you to stay away from her, she's hard work.' 

'What am I supposed to do,' he then asks. 

According to Freeman, the seven-time Superbowl champion then says, 'This has gotta stop.' 

He then ends the call by saying, 'Hey you gotta come through, oh man.' 

Freeman noted it was difficult to tell exactly what Brady was saying given the angle of the video. 

Brady announced his retirement in a seemingly serene video on Instagram on Wednesday.

But later that day he was photographed taking his daughter Vivian, 10, for a horseback lesson in Florida. 

He appeared irate and could be seen screaming into his headphones as he had an animated conversation with someone on his phone.

He seemed to be filming his daughters' lessons for a period, but the superstar quickly started yelling and gesturing angrily - at one point spitting in rage.

Cutting a casual figure in a white t-shirt and neutral-colored tracksuit bottoms, Brady's smiling demeanor quickly switched as he started pointing and raising his voice.

It is unclear exactly what made the Super Bowl winner so emotional, but he seemed to calm down by the time the lesson was over.