Roberto Mancini again apologised to Manchester City fans after his side crashed out of the Europa League to Sporting Lisbon.
The Italian said: "I'm disappointed because I might have made mistakes, and I'm sorry to the supporters.
"When a manager doesn't prepare well for the game, this happens. When I lose a game I think about why I lost and think about where I made mistakes."
At the weekend Mancini withdrew Gareth Barry for Sergio Aguero in the first half of their defeat to Swansea City. This admission of misjudging opponents came after he acknowledged he had "underestimated" Everton following defeat to David Moyes' in January.
Despite beating the Portuguese side at the Etihad Stadium, the Citizens went out on the away goals rule, with the tie ending 3-3.
Competing against a one-goal deficit from the first leg, City found themselves 2-0 down at half-time courtesy of Matias Fernandez's superb free-kick and Ricky van Wolfswinkel's strike.
With 30 minutes remaining, Sergio Aguero pulled one back before Mario Balotelli equalised from the penalty spot on 75 minutes.
Aguero then gave City the lead on the night, but despite laying siege on the Sportinguistas goal, the home side could not net an elusive winner and crashed out.
Neighbours United had earlier in the evening succumbed to the brilliant Athletic Club Bilbao 5-3 on aggregate, leaving England without a representative in the Europa League's last eight for a second successive year.
Here's a gallery of why elimination in European football's second rank tournament still meant so much to Roberto Mancini and his players