Celtic's interest was confirmed by chief executive Peter Lawwell in January 2008 who explained that the club planned on signing Mizuno, if he was granted a work permit.
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On 8 November, he made his league debut for Celtic in a 2–0 victory over Motherwell, replacing Scott McDonald in the 88th minute and, on 21 December 2008, he made his first start in a game against Falkirk He scored his first goal for Celtic in the 90th minute of the match, assisted by a pass from Shunsuke Nakamura.
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