City were swept aside by Arsenal in a surprise 2-0 victory for the Gunners, with Guardiola’s former No.2 in charge in the opposite dug-out.
Guardiola insists he knew Arteta would continue to play five at the back after their shock win over Liverpool and was frustrated to see his players woefully underperform.
He told BT Sport: ‘We didn’t play good. The only regret is not to lose the game – that can happen – but it is that we did not play the first half like we play the second.
‘We did not play good and on a day when you had to, we did not.
‘We started low and without the way you have to play.
‘We are always ready many times but today we were not.
‘I knew they play five at the back and with high pressing. They defended well.
‘It happened against Liverpool too so we knew it. But we were not good. We have to play good to go through.
‘Now we have two weeks so we want to play the final [of…