The defender will be out of contract when the season ends, while he is now 34.
Having joined from Atletico Madrid last year, he is set to move to a new club, as he has many offers on the table.
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I've not only received offers from Brazilian teams, but also from Europe and Saudi Arabia. At the moment, I'm deciding some things about my career," he said, speaking to PL Brasil.
I'm very motivated for what's to come, but respectfully finishing this contract with Nottingham Forest," he added.
I'm going to make some decisions, which are very important in my life. Now I've to focus on the end of the season and then sort out what needs to be sorted out in my life."