#2 Ronaldo (5 European Clubs)
At the peak of his career, Ronaldo was unarguably one of the most dangerous strikers the world had ever seen. He played like a winger but did so at the center of the pitch with great ease which made him a big threat to every opponent he faced.
He started his European career at dutch side PSV where his outstanding performance caught the attention of Spanish giants resulting in his move to Spain. He spent only one season at FC Barcelona scoring an incredible 47 goals in 49 games, and became the youngest player ever to win the FIFA World Player of the Year at the age of 20.
He then moved to Inter Milan for five years before returning to the Spanish Capital to become one of the few players to have played an El Clasico for both sides. He netted 83 goals for Real Madrid in a span of five years followed by his move to his former club's arch rivals AC Milan in 2007.