After a deadline day move to Liverpool was blocked by Palace on Monday, Guehi can now commit to a pre-contract with any foreign club from January 1 as his deal runs down this season.
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The Mirror says Real and Barca are now monitoring Guehi's situation and ready to pounce.
For their part, Liverpool are also in the mix, but cannot secure Guehi to a pre-contract over the New Year. Instead, it's suggested the Reds could tempt Palace to sell with a new offer for the defender.
Palace and Liverpool had agreed a £35m fee for Guehi on Monday, only for the deal to be stopped by the Eagles after manager Oliver Glasner threatened to quit if the sale went ahead.