Based on the recent reports of 3 midfielders, 1 left back, 1 experienced striker:
Midfield:
Elliot Anderson(23) - £105m
Carlos Baleba(22) - £60m
Leon Goretzka(31) - Free
Lots of combinations possible with this. Anderson can play next to Mainoo in most games. If we need more legs and physicality in our 4-2-3-1, bring in Baleba for one of them, most likely Mainoo. Goretzka would probably be available for around £5-6m/y (that's roughly the contract AC Milan are offering him). He can be backup as an 8 or 6. Adds some much needed experience, especially in the Champions League.
Long-term, with Bruno out of the picture, there's even the possibility to play proper 4-3-3 with Mainoo-Anderson-Baleba and without a traditional 10. That midfield would be able to do a bit of everything really.
Left Back:
Lewis Hall(21) - £60m
There's an apparent rift in his relationship with Eddie Howe in recent weeks, which might open up an opportunity here. He's the most straight forward Shaw replacement out there. Adds what Shaw can't do anymore from the left. Combine his running power and delivery with Cunha or Dorgu and we're instantly a much greater threat on that side. Just watch Mainoo's goal against Liverpool to see how much we can benefit from better and more frequent overlapping runs from our full backs.
Backup striker:
Jean-Phillipe Mateta(28) - £40m
Good Premier League striker. Brings essentially most of what Sesko does. Strong finisher, decently quick, good in the air, holds the ball up well.
One year left on his contract this summer. If he hits some form, he could even challenge Sesko for the starting spot, or of course be thrown on in the last minutes of a game in addition to Sesko, when we're looking for a goal.
Alternative:
Raul Jimenez(35) - Free
Solid player at both Wolves and Fulham. Much better suited to Premier League football than Zirkzee. Could still sign a new contract with Fulham though.
- £225-265m
Sell:
Joshua Zirkzee - £25m
Manuel Ugarte - £20m
Marcus Rashford - £25m (Barcelona)
Rasmus Hojlund - £38m (Napoli)
Andre Onana - Loan (Anywhere)
Casemiro - Out of contract
Jadon Sancho - Out of contract
Tyrell Malacia - Out of contract
Assess De Ligt's and Martinez' fitness towards the end of pre-season. If there's doubts, find a smart Lammens-type deal for a central defender. If the club wants to send Vitek out on loan again, find a free/cheap goalkeeper who's better than Bayindir; Nick Pope or Yann Sommer perhaps.