Real came close to signing De Gea last summer before his deadline day move fell through due to paperwork problems.
But Calderon claims the Spaniard could be on his way to the Bernabeu at the end of this season.
"Apparently there is some agreement. They had a deal from last [summer] for him to come but I can't tell you [for sure] as I don't have personal knowledge of that," the 64-year-old told talkSPORT.
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