Lukaku has struggled for action since his summer arrival from Anderlecht.
"You have to be willing to make sacrifices if you really want to succeed at a big club, so I have to be patient," he told Sporza.
"However, if my situation doesn't change in the next six months, I might opt for a one-year loan spell elsewhere.
"That could be in England or in a country like France. I could have a good year at another club, and then return to Chelsea as a better player."