Jan Prinsloo won caps for South Africa (RU) while at Western Province against France on Saturday 26 July 1958, and against France on Saturday 16 August 1958,[1] and represented Rugby League XIII (RL).
Prinsloo played a vital part in finishing dazzling moves for many a St. Helens victory including the sensational 1959 Championship Final win by 44 points to 22 over a great Hunslet side where Prinsloo exhibited a fabulous touchline dash rounded off with his trademark 'swallow dive' over the try-line.
The following year brought more success with a hat-trick of tries against Workington Town, his last match for St. Helens was against Warrington on Saturday 7 January 1961.
Prinsloo had the daunting task of wearing the St. Helens number five jersey at the same time as Tom van Vollenhoven was setting the whole game on fire on the other wing.
Jan Prinsloo played on the wing in St. Helens 4–5 defeat by Warrington in the 1959 Lancashire Cup Final during the 1959–60 season at Central Park, Wigan on Saturday 31 October 1959, and played on the wing in the 15–9 victory over Swinton in the 1960 Lancashire Cup Final during the 1960–61 season at Central Park, Wigan on Saturday 29 October 1960 in front of a crowd of over 31,000.