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He is an Italian's Football Referee, International Referee. Born in Rome, is the actual umpire since 1994 and belongs to the "Riccardo Lattanzi" (Roma 2). He debuted in Excellence in November 1999. Two years later he was promoted, and in the 2001-2002 season, made his debut in series D. Here it remains for three years in the workforce, in 2004 and therefore makes another leap in class, passing the CAN C. In 2005 he was awarded best newcomer whistle C2 in series, with Noble award Lino. Here the referee Roman continues his career for another three years of excellent performance, during which scores 35 in Serie C1 (including the final play-offs in 2007 (Pisa-Monza); in 2007 that allows him to take the step Italian referee to the highest category, AB, CAN, the suggestion of the designator Maurizio Mattei, and is voted the best referee of the season, with the prize Riccardo Lattanzi. for the second section of Rome, about twenty years from birth, this is absolutely the first soccer referee to achieve this goal. He made his debut in B on 1 September 2007 in Pisa-Frosinone (0-1) and then in the top flight in Udinese-Empoli (2-2), December 23, 2007, awarded at the end of the season as the best rookie referee Series A prize Bernardi. Since then he has directed a total of 42 games in Serie A (data updated at the end of the season 2010/2011), including the "classical" Juventus-Inter in the 2010-2011 season. The July 3, 2010, the split of C.A.N. A-B C.A.N. A and C.A.N. B, is placed on the staff of C.A.N. A. On August 3, 2010 he received the Award for Best Sportilia young referee of CAN A. From 1 January 2011, Valeri has been an international referee on the FIFA International Referees List.
At the end of the 2010/2011 season he was awarded with the prestigious John Mauro, the Italian referee for better distinguished.