The Real Madrid superstar will captain Portugal in the World Cup qualifier at Windsor Park.
"Yes, provided nothing abnormal occurs between now and tomorrow I believe he will be fit to play," said Portugal coach Paulo Bento at a press conference in Belfast on Thursday.
Northern Ireland go into the game boosted by last month's 1-0 win over Russia and that result has Bento on his guard.
"Northern Ireland beating Russia was a warning to us," he said.
"We knew that this match was going to be tough, but the last match and the way that Northern Ireland beat Russia showed that they are really a strong squad and we have to be aware of what they can do."
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