The club failed to sign him last year due to complex ownership rights.
Feyenoord plans to leverage its guaranteed spot in the UEFA Champions League to convince the Spanish defender to move to the Netherlands.
"He was already on Feyenoord's list last year. They tried to get him, but it was very difficult regarding rights.
Feyenoord can offer him Champions League.
If they can get him, they are doing good business, if you believe the international scouts," said Krabbendam.
The potential arrival of Mármol is also necessitated by impending changes in the defensive line, as current squad members seek new opportunities abroad.
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"I heard stories that Tsuyoshi Watanabe is also looking further and maybe wants a next challenge," said Krabbendam.
