Morrison was in the Republic of Ireland's 2002 World Cup squad
Clinton Morrison may have called time on his days at Palace after failing to return for pre-season training.
The Republic of Ireland striker, who returned from Birmingham City for a second spell three years ago, has rejected a new deal.
Manager Neil Warnock told BBC London 94.9: "He didn't reply to our contract offer, and likewise his representative told me he's speaking to a few clubs."
Morrison, 29, is the club's fifth highest all-time scorer with 113 goals.
He scored 16 goals last season, most of which came in an inspired mid-season run of 11 in 14 games, to help the club to the Championship play-offs.
But Warnock is holding no grudges over Morrison's decision to seek a better offer.
"It's one of those things," he said. "I respect Clinton too much.
"He knows the way I'm going to play next year and he's better in a 4-4-2.
"He didn't really want to come back and not get a game and get frustrated.
"He's such an important part here. And, you never know, I've not heard from him yet.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.
Bookmark with:
What are these?