And despite starting on the bench the 28-year-old's energy after entering the fray, plus an opportunist score, will have no doubt caught the eye of the Ireland chief.
Dave Kearney - who plys his trade with RaboDirect PRO12 leaders Leinster - also crossed for a try, as did O'Leary's Munster teammate Simon Zebo, but it was not enough to stop the Saxons taking the win.
The Wolfhounds' pack had a torrid time throughout the Sandy Park clash with Ben Spencer and Thomas Waldrom crossing for tries to go with 13 crucial points from the boot of Gloucester fly-half Freddie Burns on his home ground.
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