Pep Guardiola is just protecting the future of the club, he is not a kind of coach that built for just two or three seasons their in charge. Pep Guardiola wants to bring in Young stars that is why he will not allow Manchester city to give Gundogan a two years contract, if he don't accept the one year, Pep Guardiola will open the door for him to exit. Gundogan has won everything for the club and captain,he has proven to be world class, every team will buy him, because his price has increased in the market after the champions league and the treble they won this year.
Manchester city has Gundogan replacement in the team already so he won't be a problem to pep Guardiola if he leaves.
I love the incoming players they're not bad player's, they're also players who can keep up with the kind of game his playing, sad thing I'll see happen is seeing or watching Gundogan leave Manchester City.
And just as he said, if Barcelona successfully get him, he'll bring so much quality and numbers to the midfielder's and also assistant to the attackers.
Kovacic can not be the replacement for Gundogan, he's not even up to the task, most Chelsea fans that knows ball will rather prefer an exchnage between the players than just seeing such big assets leave for Barcelona. Another player most likely to leave is Bernado Silva who has been linked to PSG.