Keisuke Honda gave the Samurai Blue a 16th-minute lead but two goals in as many second-half minutes from Wilfried Bony and Gervinho earned three points for the West Africans.
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"In general we started well and played dynamically in the opening stages," the 61-year-old told reporters after the game.
"As for what happened, Ivory Coast increased their strength and were able to beat us. It was true in the last 20 minutes of the first half as well but we weren't able to attack them enough.
"We let them attack us when we should have played more aggressively. We gave their players too much space and didn't play well defensively or offensively.
"Ivory Coast won because they had space. Normally we can play quickly but we gave them too much room."
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"We have two games left and now we have to improve our morale," he continued.
"We have to play better than we did [against Ivory Coast] and, if we can do that, then we know we're capable of producing good results. The past is in the past; what's important is what's coming next.
"Normally we know what we have to do and, when we accomplish that, our results are fantastic. [Here] we didn't just play an excellent opponent but we didn't play to our standards."