The 2015 - 16 season has proved United are short of being a championship - winning side .
The addition of a superstar signing looks more likely after the team 's failure domestically and in the UEFA Champions League .
The 2015 - 16 season has proved United are short of being a championship - winning side , and the addition of a superstar signing looks more likely after the team 's failure domestically and in the UEFA Champions League .