LA Galaxy are the favourites to sign the Swedish striker, who would follow in the footsteps of David Beckham, Robbie Keane and Ashley Cole if he were to sign for the team from California.
Ibrahimovic is back training with the United squad after suffering an injury on Boxing Day, and he believes he still has a part to play in Manchester United's final games of the season.
The MLS season begins in two weeks and LA Galaxy are willing to make Ibra the highest paid player in the competition's history.
"If it happens, it happens, and once it happens, then we'll give thought to it," Galaxy coach Sigi Schmid said. "Obviously, he's been a successful player, he's won trophies everywhere he's been, but until it happens, I'm not going to worry about it."