The 20-year-old, who is third on the European money-list, would have to compete in 15 events on the PGA Tour if he makes the move.
“The way the schedule is, it makes it a little bit easier for me to play in America next year,” said McIlroy.
“I’m in no great rush to join the PGA Tour but the opportunity might not be there forever.”
McIlroy could earn a card automatically through winnings earned in 2009 US Tour events.
He was third in the US PGA Championship and fifth in the Accenture Matchplay World Golf Championship.
McIlroy added: “There’s no rush all round because I have to make my decision before 1 December. I’ll be making it before then.”
The Holywood player’s focus this week is on the Dunhill Links Championship in Scotland
European money-list leader Martin Kaymer and second-placed Paul Casey are both absent, recovering from injuries.
McIlroy, who finished third in the 2007 tournament to earn his tour card not long after turning professional, can go top even if he finishes second.
He plays with his father Gerry in the pro-am format event over St Andrews, Carnoustie and Kingsbarns courses, starting on Thursday.
“It’s a big deal for me this week and the Race to Dubai will be in the back of my mind all week but first and foremost I’ve got to get my dad round,” joked McIlroy. – Bbc