In an interview with Playboy, the 40-year-old confessed that whether or not he returns for another 007 instalment will depend on the success of the upcoming Quantum Of Solace.
"I did sign on for four so a piece of paper says there are two more to do," he commented. "But let's see how this one goes. In the film business, everything doesn't always go according to plan. We'll wait and see. If it goes wrong, we'll have to rethink things."
The 22nd James Bond adventure, Quantum Of Solace, is released in UK cinemas on October 31.