The 48-year-old's departure was confirmed by the club this lunchtime following widespread speculation suggesting he was on the point of returning to his native Australia.

Irish have now granted Smith early release from his contract which was due to expire on June 30.

London Irish forwards coach, Glenn Delaney, will take on the role of interim director of rugby until the end of the season when a permanent replacement for Smith will be announced.

Smith said: “My family has to be my priority right now which is why I have asked to be released from my contract early

" I have thoroughly enjoyed my 10 year association with London Irish and will look back on my time with fond memories.”

Smith had two spells with Irish as director of rugby. Between 2005 and 2008 he took the club to third place in the Premiership table and to the final of the European Challenge Cup.

He also led Exiles to a memorable Heineken Cup semi-final with Toulouse at Twickenham in April 2008.

He was released by the club in July of that year to join the RFU as England attack coach under Martin Johnson.

Smith returned to the Exiles in 2012 during a challenging time for the club. He retained Exiles top-flight status for three successive seasons, but leaved with the team one-place off the bottom of the table.

However, Exiles' results were picking up again and they defeated Exeter Chiefs 28-26 at Madejski Stadium on Sunday, their fourth league win in 13 matches this season.

Irish are also well positioned to qualify for the European Challenge Cup knockout stages as they top their group going into Saturday's home clash with Grenoble (3pm ko).

David FitzGerald, Executive Chairman of London Irish said: “London Irish is grateful to Brian Smith for the contribution he has made to the club.

"He led us to the greatest experience we’ve had to date of European rugby and introduced some great players to the Club.

"We believe that, following Sunday’s results at Madejski Stadium and Kingston Park, our Premiership status for next season is more or less secure and allows us to focus on preparing for next season.

“All involved with London Irish, especially the new owners, would like to personally thank Brian for his considerable contribution over the last two and a half years and wish him and his family well for the future.”

Meanwhile, Delaney will be assisted by Richard Whiffin and Mark Tainton and the club’s Academy coaching team of Nick Kennedy, Declan Danaher and Paul Hodgson.

Former Ireland coach Declan Kidney and ex-Irish star Bob Casey are among the leading candidates to replace Smith on a full-time basis this summer.