Manchester United midfielder Shinji Kagawa admitted he had trouble sleeping on Saturday night and he was his own biggest critic after a sub-par performance in Japan's 2-1 defeat to Cote d'Ivoire in their opening game of the World Cup finals.
"I lost a battle with myself," Kagawa told Kyodo News after Sunday's training session when asked why he had been unable to make an impact on the game in Recife.
"There was pressure and nerves and at the start I made mistakes and I'm taking a good look at myself. I couldn't get into a good rhythm and was beaten psychologically.