The legendary former out-half has not coached against his old team since the 2016/17 season when he was an assistant at Racing 92.
Tickets for the Stade Marcel Deflandre will be in high demand for the clash which will take place on the first weekend in April.
Despite winning just one pool match, Ulster squeezed into the knockouts after the Sharks' heavy defeat to Bordeaux earlier today.
If Toulon fail to beat their hosts by more than 36 points, then Leinster will secure a top two seeding and face Stuart Lancaster.
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