LEINSTER assistant coach Richie Murphy believes Jordi Murphy's back-to-back man of the match awards "puts him right in the shop window" to play against Castres.
With Seán O'Brien out long term, the initial selection plan was that Shane Jennings would step into the seven jersey with Dominic Ryan next in line.
There is now a question mark beside that call: "Jordi has been very good. His physicality, ball carrying, pace and reading of the game is really good so he's right up there," said the skills and kicking coach.
There are injury issues over flanker Rhys Ruddock (calf strain) and hooker Aaron Dundon (AC joint). Both of them will have to take a wait-and-see approach, while veterans Jennings and Leo Cullen are back in contention to start.
Former Leinster out-half Murphy is impressed with how Castres go about their business, especially at Stade Pierre-Antoine which has become a fortress for them.
Leinster know how Castres like to attack and how they tend to use the ball after the second-round pool meeting when Leinster beat the French side 19-7 at the RDS.
But there is a world of difference between any French club away and at home.
"Yeah, it was good to get a look at them. But, you get over there and it is going to be a very different situation. I think they are unbeaten at home in the (Top 14) league for over a year," he noted.
"I know Ulster beat them over there last year in the Heineken. We've been up against these situations before and the guys look forward to challenges like that.
"I think they've only conceded five tries on their home patch this year. It will be a very difficult day against a big physical team that likes to carry the ball at you."