Serie A title-contender Napoli and team captain Paolo Cannavaro have been ordered by the Italian soccer federation to face match-fixing allegations.

Current and former Napoli players Gianluca Grava and Matteo Gianello and former Napoli assistant Silvio Giusti were also called in for questioning over the Sampdoria-Napoli match in May, 2010.

Gianello and Giusti are accused of sports fraud, while Cannavaro and Grava are accused of failing to report fixing. Cannavaro is the younger brother of former Italy captain Fabio Cannavaro.

Several others were also called in for questioning over alleged fixing in the lower-division Portogruaro-Crotone match in May, 2011.

Napoli trails Serie A leader Juventus by three points, as the southern club chases its first title since Diego Maradona helped secure the championship in 1987 and 1990.