Juan Mata is sorry seeing David de Gea leave Manchester United.
Mata left United a year ago for Galatasaray.
He wrote: "Don't really want to believe it. The amount of times that you saved us...
"Always professional, always sticking up for the club you love, your home. You deserve the best. Sad day for Manchester United. Legend."
Like De Gea, Mata is currently a free agent.
