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 minutes 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.The most important thing is that Kevin De Bruyne must not be too tired and if he needs it, it is possible that Pep Guardiola can include him in domestic league matches this January so that his performance can also be maintained. I just realized that both players are injured and it is hoped that Haaland will recover quickly considering that Kevin De Bruyne has returned and that the chemistry between these two players will also reconnect.