Having come to Franklin's Gardens in the pre-season of 2010/11, Clark quickly established himself as an integral part of Jim Mallinder's squad and no one made more than his 35 appearances across the campaign.
After captaining the side for the first time in the LV= Cup against Saracens, the former England U20 skipper scored his first try in Saints colours against the Dragons in that very same competition, and his first season with the club finished with a start in the Heineken Cup final.
The consistency that saw Clark feature in every game in the run to Cardiff also earned him an England Saxons call up and while a back injury robbed the 22-year-old of a summer of rugby, he picked up where he left off with a superb start to 2011/12. Despite another knock, Clark showed enough to earn a promotion into Stuart Lancaster's England EPS squad for the current Six Nations campaign that coincided with his return to Saints action against Scarlets.
Mark Sorenson is another who will pick up a club cap at the end of the season, the second row having marked the occasion on the Saints' LV= Cup trip to Bath. Sorenson, praised by Jim Mallinder for his consistency and experience, celebrated the landmark by last week signing a new deal with the Saints.
The duo's achievement means that 17 of the current squad have now made over half a century of appearances for the Saints; nine of those going on to become centurions.