I'll be extremely disappointed if we don't get in at least 5 players - GK, CB, CM, winger, striker.
GK is the only one there that would be difficult to get IMO.
An excellent, first-choice keeper is required. Most clubs aren't gonna give a second thought to rejecting a bid for theirs (e.g. Forster, Butland etc) half-way through a season.
Realistically, of the PL ones, Pickford is only semi-realistic due to Sunderland been strapped for cash.