Ayew had a great season at Swansea last term, his exploits making him the club's top scorer in the Premier League with seven goals.
The Ghana worldwide was accompanied by his star father, Abedi Pele, in completing the move.More news: China has many means to counteract US tariffs
Sources close to Ayew are saying he will leave the Liberty Stadium by the close of the transfer window on 9 August.
Crystal Palace chairman Steve Parish has said that his club are "very pleased" with the signing of Jordan Ayew on a season-long loan from Swansea City.
The move now means both Ayew brothers who ended last season at Swansea have now secured moves elsewhere.More news: Plenty of Sunshine for Final Two Rounds of PGA Championship
"I am coming this season because it is a good option for me to come to Palacetoday and that is why I chose to come to Palace is to continue Improving. It's a step up for me and I'm ready for the challenge and to get to where I think I can get to".
He also has 46 caps for his country, where he has scored a total of 12 goals but has now joined the Eagles and he could make his debut on Saturday when Palace travel to Craven Cottage to face Fulham in their Premier League opener.More news: Trump doubles tariffs on Turkey, stoking jitters