The former Manchester United and England midfielder has bowed out of the game in North America with a second straight MLS title with LA Galaxy and his teammate Keane believes he has been the main cause for the current state of the sport in this region.
"He's been fantastic for this league, hasn't he?" the former Tottenham and Liverpool striker said.
"He put the MLS on the map and made players like myself want to come over and play here because the league has grown massively. That's down to David."