Jorge Lorenzo said he has yet to make a decision on his future amid strong rumours he is heading to Ducati next season.
Lorenzo's contract with Yamaha runs out at the end of the 2016 season and Ducati have reportedly offered the Spaniard a lucrative deal.
However, the three-time MotoGP world champion revealed he is still in the process of deciding which team he will ride for next year and beyond.
"These are things that I am weighing up with my team and I would prefer to keep it private," the 28-year-old said ahead of Sunday's Grand Prix in Austin.
"I can't say more than I said in Argentina, and I would prefer to say nothing about this situation. When I make the decision, everyone will know.
"I will decide if moving to Ducati is something that motivates me or not, or if it's better stay where we are.
"I have more offers than others and it's time to decide freely and do what I want, something that others can't do."
Defending champion Lorenzo took out the season-opening Qatar Grand Prix but suffered a difficult weekend in the next round in Argentina.
Lorenzo crashed out of the race in Rio Hondo in the early stages, with Marc Marquez going on to seal victory in South America.
"I'm usually a safe rider, but in the difficult conditions in Argentina some could stay on the bike and I committed an error," he said of his crash.
"I did not calculate well at the start and instead of being patient and wait for the second bike or recover the best feelings, I pressed too much at the first corner and fell."