The image shown in Manchester city centre on Friday night says "Welcome to Carlos, Manchester" - mocking the giant blue poster erected by City when Tévez moved from United in 2009 showing a picture of the Argentina striker over the words "Welcome to Manchester".
The prank was the work of the Manchester United Supporters' Trust who described it as "a warm-hearted message from some old friends".
Tévez has been suspended by his club pending an investigation into his apparent refusal to come off the bench during City's 2-0 defeat by Bayern Munich on Tuesday.
City tried to draw a line under the situation by warning journalists not to ask manager Roberto Mancini about the issue in his usual Friday press conference.
Sir Alex Ferguson back Mancini's handling of the incident, praising him for his "strong management".