London Irish's record points scorer, Barry Everitt and former Exiles scrum-half Peter Richards will both be joining Brian Smith's coaching team.
Former Exiles fly-half Everitt will becomes the club's kicking coach, while Richards will coach the scrum-halves.
"Barry and Peter have been great performers for us during their careers," said director of rugby Smith.
"It is great they are joining our set up. It is great to have two former players back on board."
Everitt, joined the club in January 2000 and remains their record points scorer with 1,762 in 169 appearances.
He was part of the 2002 Powergen Cup winning side along with new forwards coach, Glenn Delaney.
"I enjoyed seven years as a player at London Irish and I'm thrilled to be returning to the Club in a coaching capacity," said Everitt.
"Tom Homer is an outstanding talent and has a tremendous kicking game as do new recruits Ian Humphreys and Shane Geraghty. I look forward to working with the guys when I join."
He played provincial rugby for both Munster and Leinster and club rugby at Lansdowne prior to his arrival at Sunbury.
In 2001/02 he was the Premiership's leading points scorer, setting a new record of 340 points in one season.
Richards first joined London Irish as a development player in July 1996 and made 28 senior appearances before leaving at the end of the 1998-99 season.
He went on to represent Harlequins, Bristol, Treviso, Wasps and Gloucester before returning to Sunbury in 2007.
On his return to London Irish he went on to make 84 appearances and scored 13 tries. He started for the Exiles in the narrow Premiership final defeat to Leicester Tigers in 2009.
He has played for England at every level from Under-16s upwards and excelled for two seasons with the England Sevens squad, including winning the Hong Kong Sevens in 2004.
Richards said: "I am delighted to be returning to London Irish. It is where it all started for me as a player and the springboard for my career.
"I'm looking forward to working with the scrum-halves and helping to develop their games further."