He has acknowledged that referees in Spain are somewhat less lenient than those in England.
"I have played four games with Real Sociedad and I have been booked twice," Silva told The Times.
"I think I may have a problem with the referees and I need to get back used to it!"
The 34-year-old also discussed where he most enjoyed playing in England.
"Where I've been really excited to play were the classical English stadiums," he revealed.
"Much better than in the new ones, like Arsenal's for example. I've loved going to Craven Cottage, to Villa Park or to Upton Park when it still existed. The classics were better. They were mystical."