The Republic of Ireland international has been in fine form since joining Aston Villa on loan and admits he may be back if things don't work out in the United States.
"When I go back to LA, it could be completely different. At this moment in time I can't tell what will happen. It's a case of watch this space," he said. "But people have seen over the years with the clubs I've been at, how quickly I leave if I don't think I fit in."
The LA Galaxy frontman returns to the United States next week after spending a month at the West Midlands club, where he scored three goals. He he is now being strongly linked to a permanent return to England.
"There's been talk about me staying on at Villa but, at the end of the day, Galaxy are my parent club and, first and foremost, I have to respect them," said Keane.
Keane joined the Galaxy last August and helped lead the club to the 2011 MLS title. He will be with the Galaxy for the start of the new MLS season next month.
"I've enjoyed my spell here at Villa. It's a great club but it was my choice to go to the States. I could have stayed in the Premier League for a few more years but I didn't," Keane said.