Romero has admitted he is planning a return to Argentina when his time at Old Trafford ends.
His future could depend on whether the Reds decide to keep Dean Henderson next year.
He told TNT Sport: "I have thought and talked with my wife about going back to Argentina.
"The point is that today, I am in a club where I am highly respected and valued. Leaving would not be free at all and would cost a lot of money.
“In the future, I would like to come back and be able to enjoy what Racing is."