Saul has failed to impress during his loan spell and the Blues aren't willing to fork out to keep him permanently, says the Daily Express.
The news will be a blow to Atletico who the Express claim wanted to make the option to buy mandatory but weren't successful.
Not even a stellar performance by the Spanish ace in the Blues' comfortable 2-0 win over rivals Tottenham in the Carabao Cup semi-final first leg a few days ago was enough to sway the club's hierarchy to reconsider.
Chelsea think that the £30m they'd have to splurge on Saul could be used more effectively on better midfield options.
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