It will be McGeechan's fifth trip as a coach and his seventh tour in total as he also toured South Africa in 1974 (four Tests) and New Zealand in 1977 (four Tests) as a player.
In 2005 he took over as director of rugby at London Wasps - a position he still holds - and in his first season he guided Wasps to the Powergen Anglo Welsh Cup title.
He followed that up with the Heineken Cup in 2007 and the Guinness Premiership Final title last season.
Speaking after Wednesday's Lions announcement in Dublin, McGeechan gave his views on the coaching staff assembled for the 2009 tour to South Africa and the criteria for player selection.
He also looks back on his past experiences with the Lions as both a player and coach and explains his outlook for next year's Test series.
Click here to listen to the interview in full.