Pires played for Pellegrini at Villarreal.
"When I went to Spain from Arsenal, I was a wide player," said Pires. "But Pellegrini told me he wanted to me play inside and deeper. And it worked.
"He also got the best from Marcos Senna. In fact, he developed his game so much that Senna became an international with Spain under Pellegrini.
"If the City players follow the rules, then they will have no problems with Pellegrini.
"If they don't, they will have a problem. As Riquelme found out, there's only one winner when you take on Pellegrini."