The Republic of Ireland international has missed the last two months with a knee injury, having started just nine Premier League games before the problem occurred.
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"I'm up at the end of the season," he told The Irish Times. "The club haven't spoken to me and I haven't spoken to the club but we don't need to speak: I'll be leaving Fulham. I've had a great time here but that's football.
"I've had a few whispers from here and there but I'm just trying to get this (his knee) right first.
"I've looked at the Australia or America thing for a bit, it would be a different way of life, a different league; I think life's too short just to be stuck in the rat race, if that's the right phrase, over here so I'd maybe like to taste something new before I go back home."
Duff's international team-mate Robbie Keane currently plies his trade in the MLS for Los Angeles Galaxy, and the ex-Chelsea star has admitted he love to link up with his compatriot in the United States.
"We've had a bit of banter all right," Duff added. "He obviously loves it and every six months I see he's signed a new deal so he'll be there for a good while yet.
"We'll see what happens but I wouldn't mind trying it to be fair, but I have to get back fit first.
"I've got a screw in my knee now and a screw in the knee of a jinky winger doesn't really go hand in hand, but we'll see what happens.
"We'd be up for it and we'd like to see the world but it wouldn't be for a jolly up. I'm still as hungry as ever."