On becoming known on Scotland's radar in London, he was selected for the Anglo-Scots to play against the Provinces District on 11 December 1948.
In the second half, a stack of positional changes made the match a lot closer, one of which was to put Keller on as a flanker, together with Douglas Elliot.
[2] He was capped first for Australia in 1947, first as a prop but was then moved to flanker, and played 6 times in total for the Wallabies.
In 1950, the IRB voted to ban any oversea player from representing a Scottish, English, or Welsh national side, that had previously been capped by a British Commonwealth country; and this stymied Keller's future Scotland selection, as well as Botting's future England selection.
The new rule did not preclude such a player switching nationalities once more to play for their first selected country, and Keller later returned to Australia.