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Euell still has two-and-a-half years left on his current deal but is fearful that he is being frozen out at The Addicks.
''Jason's looking at his long-term future and he doesn't think he has one here at the moment,'' confirmed Euell's agent, Tony Finnigan.
Curbishley broke the club's transfer record to land Euell in July 2001, when he paid Wimbledon £4.7 million to secure his services.
"Jason extended his contract in the summer," said Curbishley.
"It's easy for players that are not playing to think about moving away, but as far as I'm concerned when we go into a season, the squad I have is there for the year.
"He isn't happy obviously because he wants to play, especially when we play with three central midfielders - he would really relish that - but he'll have to wait for his chance.
"Jason has been our top goalscorer in the last three seasons and if he's not in the side then he has to work to get back into it - but he can't take the easy route.
"At the moment he's a Charlton player and that's how I want it."
Charlton Athletic manager Alan Curbishley has confirmed he rejected a Â£2.5 million bid from Crystal Palace for Jason Euell.
The Addicks boss is loathe to lose the Jamaica international, particularly as he admits he may be reverting his formation back to 4-4-2 soon.
Euell's versatility has been unable to aid his cause for a regular start at The Valley and Francis Jeffers is another big name upset at being left on the sidelines.