Show insiders have told The Hollywood Reporter that neither actor has been offered more money as part of current contract negotiations with broadcaster CBS.
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CBS and producers Warner Bros Television hope to persuade Kutcher and Cryer to commit to a further two seasons of the comedy.
Kutcher is thought to be the highest paid actor in TV comedy, with estimates of his salary per episode placed at $700,000 (£440,050). Cryer's salary is thought to be slightly smaller.
However, the insider says that if the idea of a pay increase is entertained, the trio would be more likely to agree to an 11th season of the programme.
It was reported earlier this week that Kutcher had begun talks with CBS about a potential tenth season of the show.
CBS has declined to comment on the negotiations or associated speculation.