Manchester United still need four or five more players to challenge the elite again, including a "world-class centre-back", according to Gary Neville.
United improved on a dismal sixth-place finish in 2018-19 by securing third place in the Premier League and Champions League qualification last season.
Ole Gunnar Solskjaer has been able to add the likes of Harry Maguire, Aaron Wan-Bissaka and Bruno Fernandes to his ranks since being named the club's permanent manager in March 2019, all of whom have made a huge difference to the squad.
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However, despite the improvements made over the past 12 months, the Red Devils still finished 33 points behind champions Liverpool and 15 adrift of second-place Manchester City, while their trophyless run was extended to three years.