I think 5 will be the minimumAgreed on the targets, but I can also see why Ancelotti has been rumoured to want a centre back - Mina is going to either need to be sold or given a new contract this summer with 2 years left to run on his and we've probably seen that Holgate isn't the answer, which leaves Godfrey (who's been great) and Keane (who's probably had his best season for us, but his lack of pace is always going to cause us issues if we want to play a higher line). The rumoured interest in Demiral and Koulibaly (laughably) makes sense. I would say we are looking at five players this summer really, but that would be easily balanced out by the number of players we may look to move on, which would probably include (but be by no means limited to) Kenny, Mina, Delph, Gomes, Besic, Walcott, Bernard, Bolasie, Tosun and Kean.
2 in defence ( RB CB ) 2 in CM and a striker