Saracens are sweating over the availability of Billy Vunipola for Saturday’s Champions Cup semi-final against Clermont after the No 8 was cited on Monday night for an alleged butt. The 22-year-old faces an RFU disciplinary panel on Tuesday afternoon and could face an immediate suspension following an accusation that he struck Leicester’s Mathew Tait. The full-back required attention after the 29th-minute collision at Allianz Park, where Vunipola was penalised for coming in at the side of a ruck but not for making contact with his head. Billy Vunipola (left) takes on Niall Morris during Saracens' Aviva Premiership win over Leicester . Former England full back Mathew Tait was caught by Vunipola during the match at Allianz Park . With Saracens travelling to France as underdogs this weekend, director of rugby Mark McCall will be desperate for his in-form back-row to be cleared. Meanwhile, Toulon are plotting a move for Australia fly-half Quade Cooper after missing out on Sale’s Danny Cipriani, who signed a new deal in February. According to reports in France, the Cote d’Azur club have tabled an offer for the Wallaby No 10 who is expected to travel to France this week to discuss terms with owner Mourad Boudjellal, who made his fortune in the comic book industry. Boudjellal has already failed to land All Black fly-halves Dan Carter and Colin Slade and is still searching for a long-term successor to Jonny Wilkinson. Cooper is currently sidelined with a shoulder injury. Quade Cooper (left) in action for the Reds against the Rebels in Melbourne earlier this month . Danny Cipriani signed a new deal with the Sale Sharks back in February .
Billy Vunipola was citied on Monday night for an alleged butt .
The Saracens No 8 will face an RFU disciplinary panel on Tuesday .
Toulon are plotting a move for Australia fly-half Quade Cooper .