The 38-year-old’s current contract at Wolves is set to expire at the end of the season.
“I’ll see what the team and what the family want to do,” he told the Sunday Mercury.
“There are two new MLS teams – one in Portland and one in Vancouver – and I don’t know if it is time (to return).
“Seattle has a team now – and Seattle is my home town. Kasey Keller is there now playing at the age of 40.
“My first pro team was the Seattle Sounders before the MLS was around in 1994.
“There might be a combination of things that could happen. Initially when I came to England the thought was that I’d go back and play in the MLS. So who knows?”