Joe Schmidt revealed his delight at Jacob Stockdale's two-try breakthrough performance as Ireland saw off Argentina 28-19 in Dublin.
Powerhouse wing Stockdale bagged an impressive brace as Ireland eased past the Pumas, who ran in three late tries in a scoreline flattering to the tourists.
Ulster's 21-year-old Stockdale now boasts four tries in four caps, and proved his Test-match class at the Aviva Stadium.
Head coach Schmidt insisted Stockdale must still keep grafting to improve, but accepted the under-20s graduate now has the chance to launch an international career of genuine note.
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"He's a kid who's learning fast, and willing to learn," Schmidt said of Stockdale.
"He's got some great athleticism, very big power and he's a young lad.
