A short time later, Balotelli is believed to have left the training ground at Carrington, on the outskirts of Manchester.
Whilst it is not the first furious argument Balotelli and Mancini have had, the pair have exchanged words both on the training ground and in matches, it does come in a period where the City manager's faith in the striker is beginning to wane.
He has turned in some inept contributions for City, including against Manchester United last month when he was surprisingly preferred to Carlos Tevez.
Mancini responded to that display by warning Balotelli he risked wasting his considerable talent by failing to devote enough time to his career. Balotelli has not played since, partly due to Mancini's own selection decisions but also a slight virus.
Although City have previously stated they will not sell the 22-year-old during the present transfer window, the development may well make the Blues think again should any club lodge a substantial enough bid.