The Sun says former Palace and Wolves striker Sako is a free agent after a spell in Cyprus and has been in contact with clubs about a return.
The destination of the France-born attacker, 33, is being kept secret but the interested outfit want to see him train before deciding on a deal.
Sako has not played for more than a year since he left Cypriot side Pafos in 2020.
He enjoyed two spells with Palace, the first of which came between 2015 and 2018 when he joined from Wolves.
Sako played 50 times and scored eight goals before leaving for West Brom.
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