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Even if Gundogan leaves Man City at least Pep Guardiola will look for other options, it's just that Gundogan contribution to Man City is quite significant and without Gundogan I don't think Man City will have made it this far in improving their performance. To be honest, Gundogan, who was appointed as Captain, explained that his role was vital enough that the decision to extend the contract was the best option. Apart from that, Arsenal and Barcelona, who had been eyeing Gundogan for a long time, had to look for other players.
Gundogan's tenure for Manchester City has been fully paid for by the treble winner he presented to his team. in this season, Gundohan contributed a lot like any other player. so naturally, if Pep still needs his services even though the player has not yet determined his future. but if he stays with City I'm pretty sure he won't start in 90 minutes of normal time. that means, in the next season it is very likely that Gundohan will not play as a regular player. but my assumption could be wrong, because I'm pretty sure that Pep will be hunting for several players in the transfer window next summer. apparently, Pep will be looking for an ideal player as a candidate for the successor to Gundohan. in fact, it could be if Silva will also leave next season.
So far, only 3 clubs are interested in using his services. namely, Barcelona, Arsenal and AC Milan. What is certain, the rumor is only that there are clubs that have clearly offered proposals. we'll see, which club will be Gundohan's future.
By the way I'm pretty sure and believe, if Pep had thought about this beforehand. that's why, there are several names on Pep Guardiola's list of recruits next season.