The Colombian had been on loan with Real Zaragoza for the 2019/20 season, but his agreement with the club was only due to run until August 5.
Real Zaragoza didn't anticipate reaching this stage of the season, and thus didn't increase the length of the agreement.
"This is an attack on the integrity of the competition, we don't know the date we are playing or our opponent, but Real Zaragoza have been harmed today," explained club president, Christian Lapetra.
"We received news a few hours ago that Watford would refuse to negotiate an extension of the deal beyond August 5, despite the fact the player wants to stay.
"We consider it incomprehensible that at this stage measures aren't being taken to protect the completion of the competition and the honest of it, we want to play in the playoffs and earn promotion, but we want to do it on equal terms."
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