The 35-year-old is eager to extend his stay with Ulster with a view to compete at the next World Cup in Japan in 2019.
With Ireland getting set to take on France in their opening game of the Six Nations on February 3, Best is keen to clear up his future ahead of the trip to Paris next month.
"I will sit down with the IRFU and with [Ireland coach] Joe Schmidt and I will make a decision on that in the next couple of weeks," said Best.
"I would like it sorted out before the Six Nations so I can concentrate on playing."
He added: "If the World Cup started right now I would have no problem, but you would need a crystal ball to know what I will be like.
"Right now I still feel I can play for Ireland at the top, top level and World Cup rugby is the top level."