Manchester United have had trouble filling the number seven shirt over the years since Cristiano Ronaldo left the club in 2009. Just ask Mason Mount how heavy Manchester United’s number seven shirt currently feels. The midfielder is struggling even when he is fully fit. For years the shirt has been a weight on the back of who wore it, leading many to quip that United did not replace Cristiano Ronaldo until he re-signed with the club in 2021. But that would not be strictly true. Edinson Cavani wore Manchester United’s number seven shirt with distinction before he reluctantly handed the number o…