 As one of the more successful non-League clubs in northern England, South Liverpool were invited to join the newly formed Northern Premier League in 1968. Notable players during the club's first ten years in the NPL were Jimmy Case and later John Aldridge, who both went on to achieve fame with Liverpool, Joe Hinnigan who became a stalwart at Sunderland, and Peter Houghton who moved on to Wigan Athletic and Preston North End.John Aldridge wrote about his South Liverpool career in his autobiography