Will sound daft but none of them. Their defensive lot is either too old or not good enough for a club that
presumably wants to build towards the elite level, midfield has a couple noteworthy options but we'll get better value for money elsewhere, Eriksen isn't very press resistant or consistently active so I'd be wary even though he has a lot of positive qualities, and forwards like Kane or Son are going to be waaaay too expensive — they're both practically married to the club with contracts running till 2023/24, so Levy will be well within his rights to take United to the cleaners and demand Galáctico type money, even before we account for the intra-league premium or the United premium or the “Woodward premium”. If I had to guess United would have to pay...
- £200+ million and £450,000 p.w. wages for Kane
- £100+ million and £300,000 p.w. wages for Dele, even though he is out of form
- £100 million+ and £300,000 p.w. wages for Son
As good as they are, Dele's regression notwithstanding, they won't be optimal investments unless we have a really good plan for incorporating them in the setup (which we haven't managed to do with most of our marquee signings in recent seasons), plus individual signings will only take you so far in a fractured and poorly organized setup, and United hasn't started the type of cycle where one offensive signing will have a significant impact on our overall performances, unless said offensive player is a Cruyff level mastermind and can arrange things on his own.
We have quite a few deficiencies from a broader perspective, and will be better served making more shrewd and diverse investments across the pitch, and organically molding players who are on the cusp into top performers. e.g. Instead of Son, we could target players that aren't inferior to the level he reached at Leverkusen: like Olmo, Daka or Hee-chan (both from Salzburg), Werner — could realistically acquire a pair of them and improve the squad as a whole, while spending less than what we would have to part with for Son.