"It's the buzz of playing these big games that gets the adrenalin flowing. You may only play one World Cup in a lifetime, so make the most of it. Performing when it matters is what counts."
Rob Howley, Wales' attack coach and an assistant on that Lions tour, said "depending on the individual" it may take "18 months or even two years to recover a level after the ecstasy of a trip like that".
No World Cup team are fielding waifs in the midfield and the lack of Gavin Henson and the retired Tom Shanklin has left Roberts dovetailing with Jonathan Davies as the first-choice, 215kg-plus pairing.
"Against the Islander teams, you can't afford to play loosely," he says. "Sometimes that does mean being confrontational, playing direct rugby, matching them physically, trying to dominate them."
Coach Warren Gatland will decide on his first-choice first five-eighths after Stephen Jones wins his record 101st cap tonight.
The experienced Jones has been waylaid by a calf injury but the 24-year-old Rhys Priestland has been impressive.
WALES v FIJI
Hamilton, 6pm, Sunday
- INDEPENDENT