Robbie Keane: I'd Love to Play with Ronaldo ... Come to the Galaxy!

Cristiano Ronaldo and Robbie Keane on the same team? In L.A.?

It's possible ... so says the Irish soccer legend who tells TMZ Sports he'd love to see Ronaldo come out west and play alongside him on the Galaxy before he retires.

Last year, Ronaldo told the media he only planned to play for about 4 or 5 years -- so, we asked Keane if there was a chance CR7 would join him in the MLS, like so many European stars are doing these days.

"I think it's probably a natural progression for him," Keane said ... "Hopefully, not for another couple of years."