Sabatini brought Pastore to Europe as Palermo sports chief.
"I can't watch him playing like he is, it embarrasses me a lot," the 63-year-old told Tele Radio Stereo.
“He used to dominate the pitch and dazzle people. He must draw on his Argentine pride if he has any: otherwise it's better if he devotes himself to something else.
“He's an all-round playmaker, he has to stay near his opponents' goal. He would tie into Giampaolo's game well, but I'll stop here. If I don't, I'd be misunderstood."