Indeed, it is the club's second successive father-son captaincy rein as hooker Richie Sweeney led the Blues this past season, following in the footsteps of his own dad JB who was captain back in 1971/72.
Darragh made a timely return from a spell in Australia in January, scoring a try in a home win over Clontarf to help St. Mary's in their bid to avoid relegation from Division 1A after a difficult start to their Ulster Bank League campaign.
Fanning, who is 26 and offers a sizeable presence on the wing at 6ft 3in and over 16 stone, has played for Connacht in the RaboDirect PRO12 and Amlin Challenge Cup. He also enjoyed a successful two-year stint Down Under with club side Tuggeranong Vikings.
His strong form for St. Mary's in the second half of the 2012/13 season earned him call-ups to the Ireland Club team - he played against the England Counties and Scotland Clubs - and the Leinster 'A' side.
Under head coach Hugh Hogan, they did manage to win the Leinster Senior League Cup last December and finished as runners-up to Cork Constitution in the Ulster Bank Bateman All-Ireland Cup.
Peter Smyth and James Norton have the coaching reins for the new campaign which begins with the defence of their Leinster Senior Cup crown - they face Bective Rangers at Templeville Road in their opening fixture on August 24.
Related Links -