De Gea recently signed a new deal with the Viola after a superb season in Florence and it has been revealed the agreement carries an "affordable" buyout clause.
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The Sun says discussions inside United have now been held about triggering the option and bringing De Gea back to Old Trafford.
Whether De Gea would accept a return is another matter, the Spanish veteran was effectively pushed out of the club.
At United there's concerns over the form and fitness of No1 Ande Onana, who suffered a hamstring injury in the first week of preseason.
Now 34, De Gea's deal with Fiorentina runs to 2028.
