Phil Jones has penned a new four-year contract with Manchester United, the club have confirmed.
Jones, who joined the club from Blackburn Rovers in 2011, had just one year remaining on his current deal but is now set to remain at Old Trafford until 2019 with the option to extend for a further year.
Manager Louis van Gaal told United's official website: ""We are delighted that Phil has signed a new contract. He is a talented footballer with great versatility and can play in a number of positions.
"Phil is a relatively young defender who is developing all the time. He missed some of last season due to injury; however, I was impressed by his professionalism and attitude during those periods."
Jones added: "I am delighted to have signed a new deal. I have thoroughly enjoyed my time here so far and am looking forward to continuing my development as a player.
"This a great club to be part of and I cannot wait to start the new campaign. I would like to thank the manager, coaching staff and fans for their continued support."
Jones, 23, has made 128 appearances during his four seasons at the club. He joins Chris Smalling, Michael Carrick and Andreas Pereira in having committed his long-term future to the club in 2015.
Jones made 22 Premier League appearances for United last season but the first half of his season was disrupted by injury.
During the second half of the campaign he often partnered Smalling at the heart of defence and the ex-Fulham defender is hopeful the two will have the chance to build on their partnership next season.
"It's one where it just builds over time and we've had our chance this season and now it is all about building on that next season," Smalling said.
"Considering the outgoings at centre back, it was a chance where players had to step in. Luckily I've been one of those who has had a good run - especially in the second half of the season."