Modric, 40, has hit the ground running at AC Milan after making the move from Real over the summer.
"I don't think there is a real secret, but rather a combination of factors,: Pintus tells La Gazzetta dello Sport.
"Luka has an outstanding level of professionalism: he is careful with his training, diet, recovery, and above all, he has a mentality that drives him never to settle. He is a rare example of sporting long-termism, the result of daily commitment."
Pintus believes that Modric's way of thinking is the main characteristic.
"The difference between a great master and a master often lies in the mentality," he says.
"Modric has a desire to work and an endless hunger for victory. This, even more than his physique, is the driving force behind his long-term perspective."