Adrian Clarke looks at key areas where each Premier League club can improve ahead of the 2019/20 season.
Clean sheets were in short supply last season and until his team become harder to break down as a defensive unit, it will be difficult to make progress.
Too many individual errors and a lack of leadership resulted in United's tally of Premier League shutouts dropping from 19 in 2017/18 to seven in 2018/19.
Aaron Wan-Bissaka's arrival will strengthen the defence at right-back but the Red Devils will also want to bring in a commanding central defender.
Solskjaer should also target an athletic central midfielder; the departed Ander Herrera provided mobility and determination in central areas, and United's off-the-ball work improved when he played.
It is essential the Spaniard is adequately replaced.
|Herrera starting||Without Herrera starting|
|Ave. goals conceded||1.19||1.59|
|Ave. points won||1.9||1.6|
The 21-year-old is raw but has electric pace and a terrific left-footed delivery.
He joins a side who made little impression in wide areas during 2018/19 - they produced the second-fewest number of accurate crosses from open play in the entire division.
For a club who pride themselves on attacking football, and using the width of the pitch, they will expect a big improvement in this department.
|Least succ. crosses from open play||Total|
A dearth of creativity on the flanks was one factor behind United's total of four headed goals last season, the joint-lowest of all 20 PL clubs.
But if their crossing improves, signing a centre-forward with a strong aerial threat would also make sense.
Headers represented a 17.3 per cent share of all Premier League goals last season but at Old Trafford it was only 6.2 per cent.
United may also consider bringing in another midfielder capable of teeing up more chances for the strikers.