The Norwegian is said to have finalised a more 'fluid' 4-2-3-1 formation for next season. Solskjaer adopted a 4-3-3 formation when he took over last December with Paul Pogba charged with getting forward as the third man in a three-man midfield.
He did get success with that system but it eventually withered off till the end of the season and thus Solskjaer is reportedly wanting to make his system fluid, as reported by and according to Andy Mitten.
Pogba has already been selected by Solskjaer to play in an attacking midfield position where he’s given more freedom to get into the box. However, this strategy could take a hit if United fail to sign a central-midfielder to feature alongside Nemanja Matic.
Moreover, the signing of Daniel James is reportedly seen as important for Solskjaer, who intends for his wingers to work hard up and down United's left and right flank while maintaining the ability to race upfield in attack.
In order to make sure that his selected formation works to its optimum capability, Solskjaer has already selected young players like Aaron Wan-Bissaka and James, who are both 21, while he has informed United of his desire to sign Sean Longstaff and Jadon Sancho, who are 21 and 19-years-old respectively.