According to transfer expert Fabrizio Romano and a number of other media sources, the 30-year-old midfielder has terminated his deal with Atletico.
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Saul's deal had just under a year to run.
He spent last year on-loan with Sevilla, but Saul is now leaving Spanish football for Turkey.
An agreement with Trabzonspor is now in place for Saul. The agreement is expected to be announced in the coming week.