Manchester United attempted to sign Raul last summer, according to his Schalke teammate Christoph Metzelder.
The Spanish goalscoring legend left Real Madrid at the end of last season after 16 years at the end at the Bernabeu and had no shortage of offers for future employment.
Raul chose to make the move to the Bundesliga by joining Schalke and now it has emerged that he had the option to seal a switch to Old Trafford.
"They [Manchester United] tried to sign him this season," said Metzelder. "He talked about it to me. I don't know if he thought about it.
"A player like him has offers - from clubs in the United States, England but also Schalke. I tried to convince him.
"He got to know Germany in the 2006 World Cup and knows the atmosphere, the stadiums, the infrastructure.
"I said to him, 'You have to experience it'. He's a big player and his influence is great."
Despite missing out on a goalscorer of proven quality like 33-year-old Raul, Sir Alex Ferguson arguably pulled off the signing of the season by brining relatively unknown Javier Hernandez to Old Trafford for £6 million.
The 22-year-old has found the net 18 times during his debut season with United, and looks set for a huge future at Old Trafford.
Hernandez also appears to be bringing the best out of Wayne Rooney, and the young duo could be United's front-pairing for years to come.