Matic says he couldn't believe the difference between Chelsea and United in terms of professionalism.
The Serbian continued to name the two players who angered their teammates most at United.
"The rest of us who were always on time were angry so we decided to form a kind of an internal disciplinary committee with me serving as its president.
"I put a sheet of paper up on the wall where I documented the names of individuals arriving late. During one particular season we collected around £75,000 in fines."