Manchester City beat Red Star Belgrade 3-2 in the Champions League after goals from Micah Hamilton and Oscar Bobb.
Erling Haaland was not involved as Manchester City trained in front of media cameras prior to their Champions League trip to Red Star Belgrade.
Mateo Kovacic says Manchester City will need to raise their level while they are without key players if they are to remain in the Premier League title race.
Manchester City came from behind to beat Luton 2-1 and end a four-match winless run in the Premier League.
Pep Guardiola accepts it is down to him to deliver the "punch in the face" that can reignite Manchester City's season.
Aston Villa secured a record 14th consecutive home victory thanks to a winner from Leon Bailey leading them to a 1-0 win over Manchester City.