The Spaniard has not played since he left the Red Devils at the end of last season.
De Gea, who won the Premier League Golden Glove that term, has been without a team all season.
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The 33-year-old this week posted footage of himself playing with National League side Altrincham.
De Gea has been linked to clubs back in Spain, including La Liga side Real Betis.
He was rumored to be a Newcastle United target in the winter, but no deal materialized.