Defender Virgil van Dijk has signed a new six-year deal at Southampton.
The 24-year-old Holland international has impressed at the heart of the Saints defence this season having arrived at St Mary's from Celtic in September 2015.
Manager Ronald Koeman spoke on Friday of his desire to keep hold of his star players this summer, so Van Dijk's new long-term contract will come as a major boost.
The deal runs until 2022 and executive director of football Les Reed said:
In his first year with the club, Virgil has quickly established himself as one of the top centre-backs in the Premier League, becoming an integral part of what has been another strong season for the team.
At 24, and with significant European experience already under his belt, we believe he can be a key pillar in our squad for years to come and we are delighted to have agreed this new deal with him.
Although Virgil only joined us in September we felt it was important to strengthen our commitment and we believe this also provides further indication of how serious our ambitions are for the coming years.
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Southampton chairman Ralph Krueger is "really, really confident" Ronald Koeman will still be manager next season and believes the Dutchman should be excited about staying at the club.
Koeman signed a three-year contract when he took over at St Mary's in June 2014 but he will soon enter the final 12 months of that deal and is yet to commit any further.
The former Barcelona defender has been linked with a return to the Nou Camp as coach but Krueger believes Saints can convince the 53-year-old to stay put.
"Next year? I'm really, really confident he will still be manager," Krueger told Press Association Sport.
"Beyond that, those are the conversations we're having now and they're really good. I like where we're at. We're in a whole different place than where we were a few years ago.
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Dusan Tadic has "no problem" at Southampton and is not seeking a St Mary's exit, according to boss Ronald Koeman.
Tadic has already moved to deny rumours he was agitating for a summer move away from the south coast, and now Saints manager Koeman has followed suit.
"For every player if he doesn't start regularly it's difficult," said Koeman of Tadic.
"You talk about what came out in the press, I spoke to Dusan and he was totally surprised. He's one of the players that if he has a problem he will talk to the manager. We have good contact.
"Even in the winter time when he wasn't playing all the time we spoke about his situation.
"There's no problem at the moment and for next season we will see what happens."
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