Toulon are the only team assured of a spot in the last eight but they need a win against the Scarlets to guarantee a home quarter-final.
Last week’s thumping win over Ulster showed the defending champions are coming into some form, and with another injury-hit side up next, they will fancy their chances of making it five wins from six.
They have resisted the urge to change things from last week, with the only change seeing Carl Hayman come back into the front row.
Steffon Armitage, a hat-trick hero last week, continues in the back row, while Leigh Halfpenny returns to Wales for the first time with his new club.
Toulon are still without Matt Giteau, who may well need an operation, but in his absence, Nicol