Looking through the list of soon to be out of contract players Franck Kessie at is the one that stands out the most as every-time I've watched him play for AC Milan he's been awesome and IMO he's already as good if not better than most of the midfielders at the top 6 teams besides the likes of Kante & De Bruyne. He'd give us the much needed control and possession that we currently sorely lack in midfield and as such it would make it much easier for us to avoid relegation this season if we paid a reasonable fee to Milan in the January window.
Plus he'll still be good enough 4 years from now even if we have a squad full of Madrid style Galacticos
I also think it would be a mistake to do much of our transfer business with English clubs because there's already a ton of broke-ass clubs in France/Spain with talented players who we can buy far easier for half the cost of overrated players like Ward-Prowse or Martial
Because of the pandemic and the recent TV deal fiasco in France we could really fill out & strengthen the weak points of our squad with smart Euro buys/loans in January instead of spending a fortune on one or two good English players like Maddison.