Manchester City boss Pep Guardiola admitted his side's first-half performance against Monaco in the Champions League left him with regrets.
City's defensive frailties cost them in the second leg of the last-16 tie as Monaco overturned a 5-3 deficit to win on away goals after a 6-6 aggregate draw.
First-half goals from Kylian Mbappe and Fabinho put the Ligue 1 leaders ahead and although Leroy Sane hit back for City, Tiemoue Bakayoko sealed victory with a header 13 minutes from time.
"First half we forget to be there," Guardiola told BT Sport.