TOTAL focus! That is what coach Joe Schmidt will demand and expect in return. Leinster cannot take a look sideways at what is going on anywhere else.
They will have to save that until The Scarlets have been properly filleted, bones and all, for five points. Otherwise, it will not matter who does what to whom.
Brian O'Driscoll made a few uncharacteristic errors in the first quarter in the PRO12 League match against Edinburgh last Friday.
From there, the Ireland captain warmed to his task, showing a clam touch in traffic and defending with his trademark wit and aggression.
Full-back Rob Kearney looked out on his feet when he left the Murrayfield pitch just past the hour mark. He will come on in leaps and bounds from that.
Luke Fitzgerald found it more difficult to get involved in what was going on around him. Still, there was one sweet surge. He will take time to fully recover his confidence.
That is okay. Leinster are blessed with the back-three excellence of the returning Isa Nacewa and possibly their most consistent player of the season, Fergus McFadden.
The players are there. The history is also there to support a Leinster win. They have triumphed in their last three Heineken Cup meetings with Scarlets.
Of course, a 'W' is not enough on its own. Leinster will be eager to go for the jugular right from the off. No matter the sounds from their camp of 'respect' and focusing 'on the process'.
All will be revealed when Leinster draw their first penalty right on the edge of fly-half Jonathan Sexton's kicking range. It is likely he will look to the corner rather than the posts.
The Scarlets have lost out in all four of their Heineken Cup pool matches, including two at home to Exeter Chiefs and Leinster.
In fact, they have been drowned out in seven of their last eight. The manner of their collapse to Ulster in the PRO12 League last Friday does not augur well for them.
Leinster v The Scarlets,
The RDS, TOMORROW, 6.0 (lIVE SKY SPORTS 1)