Not sure what people see in Diaz - he's great on occasions but quite average if you look at him across the season. He lost his place to Gakpo anyway, who'll lose it to Wirtz.
They can't lose both Nunez and Diaz unless they're getting Isak or someone else- rejected a mouthwatering Bayern Munich offer for Diaz few hours ago..
I don't think there is even any reason to lose Diaz, if Nunez does leave, I can't remember the duration of Salah's extension but I believe it's max 2 years, so still having Diaz would definitely coming in handy by then, Wirtz can operate on either side of the flank, and Chiesa is already looking like a waste of space within the squad.