As two of the most senior players in the first-team set-up, Maguire and Matic are expected to set the standards when it comes to professionalism.
And the pair are so keen to raise the bar when it comes to player conduct, that they put their heads together to come up with a set of regulations for their team-mates to follow. If anyone fell foul, a fine would be incurred.
But there was an unexpected twist just days later, when the Serbian caught Maguire handling his phone in the gym — something which is forbidden.