"Last season was a long campaign but I had a long break and I feel good," he told United's website.
"I am not thinking about what is going to happen. If I am still enjoying myself, then we will see but nothing will be decided before January."
He also believes United must make a strong start to the season if the team is to retain the Premiership.
"We must make sure we get off to a good start, like we did last season," he said.
"We have three games in the first week and it is important we do well in them otherwise we can end up under pressure straight away.
"From then on, the team will grow and the new players will learn what is expected of them."