He said: "Where we defended badly, we could compensate by being offensively remarkable. At 3-1 down, it was a mental test as we were on the verge of losing by more than three goals.
"I don't know how, but this team always finds plenty of resources to bounce back. To score four great goals in 30 minutes is fantastic. It could have gone both ways but our mental resources, togetherness and individual quality helped us to bounce back. I'm very proud of the strength we showed but it was a difficult victory.
"I felt it was down to more of a physical problem than complacency. We were all lacking a bit of sharpness. It was the start of the season, a hot day and many players had been away on international duty."