Barcelona star Lionel Messi's lawyers said Friday they "firmly believe" the Argentine player, who is accused of avoiding paying tax on income generated from the sale of his image rights, is innocent. The 25-year-old four-time World Player of the Year and his father Jorge Horacio were ordered by a Spanish court Thursday to appear for questioning in September. Prosecutors accuse them defrauding the tax office of over four million euros ($5 million).