Allan McNish will cease racing for Audi Sport with immediate effect.
The announcement means the 43-year-old Scottish driver will not race for the team in the 2014 24 Hours of Le Mans race, which he won last year alongside Tom Kristensen and Loic Duval. The move effectively ends McNish's career in sports prototype racing.
McNish started his racing career in go-karting in 1981, before progressing into the Formula Ford 1600 Championship in 1987. In 1988, he was named Autosport Club Driver of the Year, having moved to the Formula Opel Lotus Euroseries.
McNish joined the Formula One circuit in 1991 as a test driver for McLaren, before becoming a reserve driver with Benetton for the 1993 season. He completed his first 24 Hours of Le Mans in 1998, and returned two years later to place second, racing with Audi Sport.
Having joined Toyota to race in the 2002 F1 season, it was another two years before McNish returned to Le Mans with Audi, where he placed 5th. McNish placed 3rd in both the 2005 and 2006 Le Mans races, but had to retire from the 2007 event.
The 2008 24 Hours of Le Mans saw McNish finish first overall, while the 2009 and 2010 events again saw him place 3rd in both races. Having been forced to retire from the 2011 event following a collision, McNish placed 2nd in the 2012 24 Hours of Le Mans, but again triumphed in 2013, winning the race as part of Audi Sport Team Joest and going on to claim the World Endurance Car Championship at the end of the season.
Speaking about his decision, McNish said: "I feel the time is right for me to step back and to put the helmet on the side and to look at other opportunities.