The former Italy international was handed the suspension at the turn of August for allegedly failing to report to authorities knowledge of illegal activities in the Scommessopoli scandal.
Mauri was hoping to be involved in Lazio's Supercoppa Italiana final against Juventus on Sunday, but will not be able to feature as the court has requested further evidence and investigation before reaching a conclusion.
However, prosecutor Stefano Palazzi also lodged an appeal to have the original punishment of over four years reinstated after accusing Mauri of actively partaking in match-fixing.
The 33-year-old's case stems from two Lazio league fixtures against Genoa and Lecce in May 2011.
Palazzi's appeal to convict Massimiliano Benassi, Omar Milanetto, Antonio Rosati and Alessandro Zamperini, who were all cleared in the original trial, proved unsuccessful with the court upholding the initial ruling.
No official date has been set for a ruling on Mauri's appeal.