Landon Donovan believes that MLS will rival the NBA and NFL in popularity.

"Finally, Major League Soccer is very close to the others. I believe that, now, baseball, in my country, is for the older generation. Young people don't watch much baseball. American football [NFL] also has issues with security and health. Basketball [NBA] is in a good phase, but MLS is really growing. In five, 10, 15 years, I believe we will be the third, second or first sport in the country. [That it costs] $300m means everything -- because, if companies or people with money are paying a lot, this tells you business is good and that the league is growing," said Donovan.

Donovan recently came out retirement to sign with the San Diego Sockers.