Premier League: Mauricio Pochettino's future in doubt as Nicola Cortese resigns at Southampton

Nicola Cortese has resigned as chairman of Southampton.

Nicola Cortese: Has left Southampton

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Southampton have confirmed that Nicola Cortese has resigned as executive chairman, casting the future of manager Mauricio Pochettino into serious doubt.

The Argentinian, who previously had said he would quit the club if Cortese departed, left St Mary's on Wednesday without commenting on his own future.

Owner Katharina Liebherr has taken on the role of non-executive chairman while the club searches for a new chief executive officer.

"With great regret we have accepted the resignation of Mr Cortese," Liebherr told the club website.

"He (Cortese) has done a wonderful job and we very much wanted him to stay. A search has now begun for a successor.

"It is business as usual and we will ensure that the manager, team and staff at the club have all the help and support they need."

Relations are understood to have broken down irrevocably between Cortese and Liebherr, who took over as owner after the death of her father Markus in 2010.

"He (Cortese) has done a wonderful job and we very much wanted him to stay. A search has now begun for a successor."

Katharina Liebherr

Cortese became executive chairman in 2009 having been instrumental in Liebherr's acquisition of the club earlier that year, and has since overseen the club's rise from League One to the Premier League.

There was talk of Cortese considering his position in May, and Pochettino subsequently warned he too would leave Southampton if the executive chairman chose to do so.

The Argentinian, appointed as successor to Nigel Adkins in January 2013, said last year: "I would not understand staying in this role if Nicola was not here.

"The person that actually called me from the start, told me about the project and put their faith in me was Nicola.

"I have great respect as well for Southampton, the club and the supporters, but Nicola has been the one that has placed his trust and faith in me.

"I wouldn't see myself in this club if it was not for him.

"I think I am a very transparent person, a very honest person.

"We are on the same wavelength about the club and the future of the club so it really would not make any sense if I was at this club and he was not."

Having entered administration just prior to the Liebherr takeover, Southampton began Cortese's first season as executive chairman with a 10-point deduction but soon rose from the bottom of the third tier.

They achieved back-to-back promotions in 2010/11 and 2011/12 as Adkins, brought in as a replacement for Alan Pardew, guided them to the Championship and then Premier League.

After the controversial sacking of Adkins, Pochettino led the Saints to a 14th-placed finish last term, with them ending their comeback top-flight campaign five points clear of the relegation zone.

Southampton are currently ninth in the table and their next match is a league trip to Sunderland on Saturday.