As I see it
Bertrand
Tadic = Lallana
Pelle > Lambert
Lovren, Chambers & Osvaldo to replace.
At least 1x CB is required to replace Lovren, don't mind Yoshi as a 3rd choice. We don't really need to replace at RB to Chambers' level as he wasn't 1st choice + we have McCarthy and Cork who can play there. Hope we'll see more of Gaston this year so it's only really a striker and obligatory goalkeeper we need.
In summary then we need a GK, CB and CF to be level with last year, anything else in addition is a bonus.