The Togo striker has been without a club since his release by Tottenham in September, but moved to Selhurst Park this week on an performance-based deal.
Pardew is confident the former Arsenal, Manchester City and Real Madrid striker has more to give and says he would not stand in his way if a "very, very big" club came calling.
"We're going to be in a difficult position if he does terrific, in a way," he said.
"We'll have to face that problem at the end of the year. The future is very much open for Ade. It's a big opportunity for him, not only for us.
"He needs to get his career back on track. He needs to show people.
"You look at his age and it's hard to believe he is only 31. He seems to have been around for years. He really should be in his prime at this time. I think he can go on.
"He can play for another very, very big club. If we can get him up to speed and that was the case I'd certainly shake his hand and wish him very well."