Rafael Benitez has told Jonjo Shelvey he must control his anger if he wants to fulfil his potential.
Sportsmail revealed on Monday, a day after the 25-year-old Newcastle midfielder had been sent off for standing on Tottenham counterpart Dele Alli, that he has been seeing a psychologist to help him deal with his issues on the pitch.
Manager Benitez was at pains not to criticise his player in public at his pre-match press conference on Friday afternoon, but admitted only Shelvey, who served a five-match ban last season for racially abusing Wolves player Romain Saiss, could address the problem.
Jonjo Shelvey pictured at an open training session with Newcastle on Thursday
Manager Rafa Benitez has warned that he must improve his discipline or face consequences
The Spaniard said: 'He knows he made a mistake and everyone agrees with that. He is the first one that wants to change, wants to improve. We have been working on that and so is he.
'You cannot predict or prevent it, we are working on that. The situation is not what you are expecting, so you have to keep going to give the right message. At the end it depends on one second when he loses control.
'He knows. It depends