The 60-year-old has won titles with six clubs in four different countries but admits it is more difficult to win tournaments in Europe than in his native South America.
The Chilean has won competitions with six clubs in four different countries and is now eying more silverware with City.
Success eluded the 60-year-old at Real Madrid and Pellegrini admitted it is more difficult to win things in Europe than in South America, having managed in Chile, Colombia and Argentina.
Comparing City to Real, Pellegrini said: "It is difficult to compare. Different club, different leagues, but it is a very good squad. I won several titles in South America but here in Europe it is very difficult to win titles with Villarreal and with Malaga.
"But to be the manager who had the most successful career with these teams is very important for me, the same importance as a title. Real Madrid was special, a very good squad but there are a lot of things you must have, not only a good squad, to win."
Pellegrini's men are fourth in the Premier League ahead of Saturday's trip to Fulham.
City's home form, meanwhile, has been exceptional, with a 100 percent winning record at the Etihad this term producing 35 goals in eight matches.