The Brazilian forward has been stood down as the season draws to its close.
Images said to show all three of United's adidas strips for next season have appeared ahead of any official announcement.
Manchester City's goalkeeper is the subject of formal discussions as Villa seek to strengthen between the posts.
Sir Jim Ratcliffe is understood to want the England captain at Old Trafford, according to GiveMeSport.
The forward's future at Old Trafford appears increasingly untenable as the club charts a course without him.
The Atalanta midfielder, out of contract next summer, had long been associated with a move to Madrid.
