Palace are seeking cover for Daniel Muñoz and have spied Boey as a potential arrival. Manager Oliver Glasner has publicly pleaded for January additions as they seek a top four finish.
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Glasner has previously stated that the lack of squad depth in the long run can cost Palace.
"When playing European football for the first time in the club's history, you should invest and not save. We are doing well, we are still well in the league and in all four tournaments. I think January is too late," he said last month.
Palace will battle Celtic for Boey in January, with the fullback's deal running to 2028.