Peiris made his cricketing debut in 2000, playing six matches in the ACC Under-15s Trophy, alongside such names as Upul Tharanga and Farveez Maharoof.
In the first innings, he was involved in the run out of Farveez Maharoof and caught Michael Vandort off the bowling of Mitchell Johnson.
However, the sixth wicket stand between Chamara Kapugedera and Prasanna Jayawardene yielded 105 runs before both were bowled in successive over, and Farveez Maharoof and Chaminda Vaas then batted out 37 overs to add 117.