Manchester City's Ilkay Gundogan celebrates scoring their second goal with teammates during the match Champions League Group C between Manchester City vs FC Porto at Etihad Stadium, Manchester, October 21, 2020. Manchester City came from behind to make a winning start in Champions League Group C on Wednesday with a 3-1 victory over Porto at the Etihad Stadium. Pool via REUTERS/Tim Keeton

Manchester City's Ilkay Gundogan scores their second goal from a free kick during the match Champions League Group C between Manchester City vs FC Porto at Etihad Stadium, Manchester, October 21, 2020. Pool via REUTERS/Martin Rickett

Manchester City's Sergio Aguero scores their first goal from the penalty spot during the match Champions League Group C between Manchester City vs FC Porto at Etihad Stadium, Manchester, October 21, 2020. Pool via REUTERS/Phil Noble

Manchester City's Riyad Mahrez in action with FC Porto's Agustin Marchesin during the match Champions League Group C between Manchester City vs FC Porto at Etihad Stadium, Manchester, October 21, 2020. Pool via REUTERS/Paul Ellis

Manchester City's Ferran Torres scores their third goal during the match Champions League Group C between Manchester City vs FC Porto at Etihad Stadium, Manchester, October 21, 2020. Pool via REUTERS/Laurence Griffiths

Manchester City's Ferran Torres celebrates scoring their third goal with teammates during the match Champions League Group C between Manchester City vs FC Porto at Etihad Stadium, Manchester, October 21, 2020. Pool via REUTERS/Paul Ellis