Juventus winger Simone Pepe and his manager Antonio Conte's technical assistant Cristian Stellini are among the latest names to be called for questioning on Thursday in the match-fixing trial that has rocked Italy.
Striker Fabio Quagliarella scored his first goal for a year to help Juventus to a 2-0 win over lowly Novara in Serie A on Sunday while Inter Milan's revival continued with a 1-0 win at Cesena.
Juventus goalkeeper Gianluigi Buffon had a solid game in his first appearance since the World Cup as his side eliminated Catania with a 2-0 home win in the Italian Cup last 16 on Thursday.
A late Simone Pepe goal earned Juventus a 1-0 win at Lazio on Monday to keep alive their hopes of qualifying for Europe.
Juventus regained the Serie A lead after Alessandro Del Piero scored a late free kick on his 700th appearance for the club to seal a 2-1 home win over Lazio on Wednesday.
Juventus's big spending failed to pay dividends again on Sunday when their defensive weaknesses were exposed in an exciting 3-3 home draw with coach Luigi Del Neri's former side Sampdoria.
Defender Miguel Britos was sent off for head-butting an opponent as Napoli lost 3-1 at champions Juventus on Saturday, all but ending their hopes of Champions League football next season.
Champions Juventus continued their resurgence by beating Hellas Verona 3-0 at home for an eighth successive Serie A victory as Inter Milan remained top after winning 1-0 at Empoli.