Several players have been on the front pages of the newspapers rather than the back in recent weeks, leading to allegations that the club isn’t doing enough to control the highly-paid young athletes.
But Sir Bobby told the Sunday Sun: "We address the problem of discipline here every day. The behaviour of Newcastle players has always been important to us and I have stressed that time and time again.
"I am aware there might be a catalogue of incidents but we have a code of ethics at this club and a code of conduct.
"I have repeated to my players over the last five weeks that as the season was coming to an end they had to ensure this club plays Champions League football next season.
"I have asked them what are they going to do? Are they going to get the rest and the relaxation and are they going to be professional and give this club everything it deserves?
"So it's always in the hands of the players."
It is worth noting that none of the players linked to the three most recent high-profile incidents have actually been charged with anything yet, and that the police’s decision to drop an investigation into an alleged assault by Jonathan Woodgate passed the press by.