Southampton have relieved manager Nigel Adkins of his duties and appointed Mauricio Pochettino in his place.
Adkins took over on the South Coast in September 2010 and steered the club from League One to the Barclays Premier League in successive seasons, and Saints are 15th after losing only two of their last 12 games.
Pochettino, 40, took over as coach at Espanyol in January 2009 and steered the Barcelona club away from relegation. The former Espanyol and Argentina defender was dismissed in November last year with the club in bottom place.
"This decision has been made with the long-term ambitions of Southampton Football Club in mind," chairman Nicola Cortese told the club's website. "Whilst we acknowledge the contribution Nigel has made during the past two years, for the Club to progress and achieve our long-term targets a change was needed.
Pochettino's first match in charge will be the Barclays Premier League home fixtue with Everton on Monday.
"There is a clear vision to take the Club to a new era of sustained success in the Premier League, and beyond, which I’m delighted to be part of", said Pochettino.