Former Rangers manager Pedro Caixinha is now in charge of Santos and worked with Windass at Ibrox.
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TalkSPORT says a bid has now been tabled by Santos for Windass.
The 30 year-old, meanwhile, has confirmed the interest, stating: "I used to work with him (Caixinha).
"It came as a surprise this morning to be honest when my agent called me."
It's been suggested Santos' offer is for £10m, but Windass laughed: "I don't think it's that much!"
Santos are rebuilding ahead of the new season in the Brasileiro Serie B.