Stade Français head coach Gonzalo Quesada admits he faces a tough call between Jules Plisson or Morné Steyn for this weekend's Champions Cup quarter-final against Leicester Tigers.
Steyn started in Stade's Top 14 triumph last season with Plisson out injured, although the 24-year-old recently started three times for France during the Six Nations.
Stade head to Welford Road as heavy underdogs, and Quesada knows that making the right decision when it comes to who will start at number ten is vital.
"It's a very difficult choice this weekend," he told Rugbyrama.
"I finally get to choose between two rich options. Throughout the period that Jules was unavailable, Morné played some very good matches. [Plisson] then followed that up with some great performances.
"Right now both of them have a very good kicking game, are good in defence and both play in the style we want them to. They're hard workers and have a great attitude.
"They're two international fly-halves, but I can't say who will start. It's undecided."