Former Pompey captain Robinson linked back up with ex-Millwall boss Kenny Jackett in the summer 2018, appointed as a coach on a part-time basis.
‘Robbo’ will combine his off-field duties with his playing career at National League newcomers Havant and Waterlooville, for whom he penned a deal on June 14, 2018 following his release from AFC Wimbledon.
The former Lions skipper – who featured 362 times for the London club between 2001 and 2014 – first played under Jackett as an Under-10 at Watford, during a stint in the Hornets' youth team.
And the pair were reunited again in November 2007, as Jackett appointed Robinson as club captain following his arrival as manager.
Success followed, with Robinson netting the goal that sealed promotion to the second tier in the 2010 League One play-off final, as Millwall ran out 1-0 victors against Swindon at Wembley.
In August 2014, then-Pompey boss Andy Awford brought him to the club on loan, before the centre-half agreed a permanent move to Fratton Park the following January.
Despite being named club captain on the eve of the 2015/16 season, Robinson left the Blues by mutual consent on July 31, as new manager Paul Cook assembled his squad for the upcoming campaign.
Signed a one-year deal with AFC Wimbledon in the summer of 2016, winning promotion to Sky Bet League One during his maiden season at Kingsmeadow after the Dons beat Plymouth 2-0 at Wembley on May 30.