However, he admits Jeremy Doku is now ahead of the England midfielder.
He will be back," said the City manager.
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"He's struggled this season and Jeremy has made an incredible step forward as everyone has seen in the last games. But Jack will be back at the level of last season, I'm pretty sure."
Guardiola added: I know some players have to take a decision on whether they stay with us and some players might come.
My sporting director says everything is fine for next year but right now, I don't know what might happen."