Heineken Cup: Toulon v Cardiff Blues (Sat) Heineken Cup Pool 2: Toulon v Cardiff Blues Prop Gethin Jenkins will lead Cardiff Blues when they bid for a stunning Heineken Cup double over holders Toulon on Saturday. Boss Phil Davies has made five changes with Jenkins fit for his first start since October. Rhys Patchell's injuries give Gareth Davies a fly-half chance and Chris Czekaj is at wing instead of Harry Robinson (leg). Lock Chris Dicomidis comes in and Macauley Cook moves to flanker. Jenkins, who spent 2012-13 at Toulon, takes over at loose-head prop from Sam Hobbs, who also relinquishes the captain's armband to the Wales and British and Irish Lions star. Patchell's shoulder and knee trouble also mean full-back Leigh Halfpenny is fly-half cover at Allianz Riviera, Nice. Wales and Lions captain Sam Warburton remains absent with a shoulder problem and Josh Navidi is at open-side. A late Gareth Davies try and Leigh Halfpenny conversion gave them a 19-15 October win. Toulon are top of Pool 2 with Blues two points behind on 13 points. Gareth Davies scores Blues' October winner against Toulon Halfpenny, who is out of contract at the end of the 2013-14 season, has been linked with Toulon - among other clubs. But boss Phil Davies says the uncertainty will not unsettle Warburton's Wales and Lions colleague. "Leigh will cope with it all right," said Davies. He's very professional and will only be thinking of the 80 minutes on Saturday and what he's going to do there. He's a pretty level-head character and, at the moment, he's focused on playing well in the blue jersey. He won't let anything distract him. New Blues backs coach Paul John will not travel to France as he works through the end of his Wales Sevens contract and remains part of Pontypridd's coach set-up. Both sides have won three games going into the penultimate pool stage game. Phil Davies' Blues won only one of their festive Pro12 Welsh derbies, a 21-13 New Year's Day win over Newport Gwent Dragons at the Arms Park. They had failed to win in their previous four encounters since beating Treviso 17-13 on 2 November. But after an opening 44-29 defeat at Exeter in Europe, the Welsh region have beaten Toulon and Glasgow - twice. Toulon lie fifth in the French Top 14 with eight wins and a draw from 16 games. Saturday's visitors to Nice have seven defeats and a draw from 12 Pro12 encounters to lie ninth, the lowest-ranked Welsh teams in the competition. The star-studded French side have lost their last two encounters, a 14-3 loss at Racing Metro and a shock 22-21 home defeat by Grenoble last weekend. Toulon: TBC Cardiff Blues: Leigh Halfpenny; Alex Cuthbert, Richard Smith, Gavin Evans, Chris Czekaj; Gareth Davies, Lloyd Williams; Gethin Jenkins (capt), Marc Breeze, Benoit Bourrust, Chris Dicomidis, Filo Paulo, Macauley Cook, Robin Copeland, Josh Navidi. Replacements: Rhys Williams, Sam Hobbs, Scott Andrews, James Down, Ellis Jenkins, Lewis Jones, Dafydd Hewitt, Dan Fish. Referee: Greg Garner (RFU) Assistant referees: Steve Lee and Andrew Pearce (RFU)