Summary Ferguson, 71, guided United to 13 PL titles and two European Champions League crowns in 26 years.
LONDON (AFP) - Alex Ferguson will retire as Manchester United boss at the end of the season, the Premier League champions announced Wednesday, ending the most successful managerial reign in English football.
Ferguson, 71, guided United to 13 Premier League titles and two European Champions League crowns in 26 years in charge at Old Trafford.
Rumours of Ferguson s shock retirement only began circulating a day earlier, but he said it was a decision he had been considering for some time.
"The decision to retire is one that I have thought a great deal about and one that I have not taken lightly. It is the right time," Ferguson said in a statement.
"It was important to me to leave an organisation in the strongest possible shape and I believe I have done so," added Ferguson, who will bow out with United having wrested back the Premier League title this season from local rivals Manchester City.
Ferguson will remain at United as a director and club ambassador, and said he was confident he was stepping down as manager with the team in good shape.
"The quality of this league-winning squad, and the balance of ages within it, bodes well for continued success at the highest level whilst the structure of the youth set-up will ensure that the long-term future of the club remains a bright one," he said.
"Over the past decade, the Glazer family have provided me with the platform to manage Manchester United to the best of my ability," he added in a reference to the club s US-based owners.
United gave no indication of a successor, amid speculation Everton s David Moyes could fill the Old Trafford hot seat vacated by his fellow Scot.
Real Madrid manager Jose Mourinho, who established a friendly rivalry with Ferguson while in charge of United s rivals Chelsea, has also been touted for the role.
However, Moyes was the odds-on favourite with several leading British bookmakers.
David Gill, who forged a highly succesful partnership with Ferguson as United s chief executive, paid tribute to the veteran manager.
Arguably the highlight of Ferguson s career was the unprecedented Treble of 1999, which included the Premier League, FA Cup and a thrilling come-from-behind win against Bayern Munich in the Champions League final.
Ferguson s final game in charge will be away to West Bromwich Albion on May 19.
Ferguson is due to have a hip replacement operation after the end of the season but until rumours broke Tuesday there was no indication he was about to step down.
Ferguson, the owner of several racehorses, was due Wednesday to have a day out with his players at the Chester racecourse near Manchester.
It is not the first time that Ferguson has announced he was quitting. In 2002 it seemed as if Ferguson was on the brink of retirement, only to make a dramatic U-turn.
The former Glasgow Rangers striker s managerial career began with Scottish lower league club East Stirlingshire in 1974 and saw him win 49 major trophies in all.
Ferguson forged his managerial reputation in charge of Aberdeen, taking the Dons to a trio of Scottish Premier League titles and the 1983 UEFA Cup Winners Cup before joining United in 1986.
In spite of all his subsequent success, Ferguson s early years in charge of United were frustrating as he sought to end the domestic dominance of arch-rivals Liverpool and it appeared as if he might even be sacked in 1989.
But England great Bobby Charlton urged his fellow directors to stick with Ferguson and their patience was rewarded in 1993 when the club won its first English title in 26 years.
