Cape Town - Pep Guardiola was disappointed with Manchester City's defending despite beating Southampton 6-1 on Sunday.
A Wesley Hoedt (6') own-goal kicked off proceedings before further strikes from Sergio Aguero (12'), David Silva (18').
Danny Ings (30') pulled a goal back from the penalty spot, but the floodgates remained open, with Raheem Sterling (45'+2, 67') and Leroy Sane (90'+1) also both on target.
After the game, Guardiola said: "We did some very good things, the first 20 minutes was excellent and offensively we were very good, but we conceded a lot.
"The game gave me a good feeling, but at the same time, we didn't defend well, although with 6-1 I am so satisfied. We were lucky to score the fourth goal in the final minute of the first half, because otherwise it would have been complicated after half-time.
"As a team, he [Mark Hughes] demanded a lot, and today we were very clinical, especially at the start, and we had the feeling we would create a lot of chances.
"But when they had the ball in midfield we didn't control the balls, they won all the second balls, we had to defend deeper and were not stable enough - and that's why the fourth goal was so crucial."