Kevin De Bruyne returned strongly by the FA Cup game Manchester City played recently. A very short time after he was subbed in by Guardiola he made a nice assist. 
The return of KDB is a massive boost to City's chance of defending all the trophies they won last season, now Pep has to be careful with how he introduces him back into the team, he definitely cannot last 90 minutes for now, so he would prolly be given between 35-40 per game, until he returns to full fitness. The schedule in January is less busy, so it is enough time for City to refresh and welcome back more injured players like Stones and Haaland, with a fully fit squad in early February, City will be unstoppable and go on to win the title for the fourth time in a row.