Manchester United have triggered a one-year contract extension clause to retain the services of Ashley Young until the end of next season.
The 32-year-old's deal was due to expire this summer but United have confirmed they have taken up the option of an extra 12 months.
Winger turned full-back Young has been in fine form this season and is back in the England picture ahead of the World Cup.
His inclusion in the latest squad for friendlies against Holland and Italy this month suggests he has a strong chance of going to the World Cup in Russia.
Young has predominantly played as attacking midfielder or forward throughout his career, both centrally and out wide, but he has proved a competent left-back under Jose Mourinho at Old Trafford.
Young joined United from Aston Villa in 2011 and featured in the side that won the Premier League in 2013.
He had a spell out of favour under Louis van Gaal and he was also used sparingly in Mourinho's first campaign in charge last season.
Indeed, he was linked with a big-money move to China in January 2017 but he stayed on to fight for his place at Old Trafford and has become an integral part of Mourinho's side.
Ashley Young insists his hunger for the game remains strong despite admitting uncertainty over his Manchester United future.
The former England international has started only 13 games for United this season and was linked with a move to the Chinese Super League in January and February.
But with eight of those starts coming in United's last 13 games, Young is back in the fray and wants to concentrate on events on the pitch.
Manchester United winger Ashley Young has signed a new contract until 2018 with an option for a further year.
"To be able to continue to play football at the biggest club in the world means everything to me and my family," said Young.
Young has scored 13 goals in 115 appearances since joining United from Aston Villa in 2011, helping them lift the Premier League title in 2013.
He played in a number of positions last year, deployed at wing-back when Louis van Gaal used a 3-5-2 formation, and kept his place ahead of the now departed record signing Angel di Maria once a 4-3-3 formation was adopted.
Van Gaal said: "We are delighted that Ashley has signed a new contract. Ashley is a very multi-functional player. He took to the wing-back position with great confidence and flourished on the wing throughout last season. Ashley is always very professional and has a great presence in the dressing room. "
Ashley Young is playing with a smile on his face once again, having gone from outsider to key man at Manchester United this term.
The 29-year-old's days at Old Trafford looked numbered not so long ago, yet he has ingratiated himself with United fans with some standout displays.
Young has become a key figure under Louis van Gaal and produced another fine display on Saturday, playing a key role in both goals as Crystal Palace were overcome 2-1.
"I'm enjoying my football, playing regularly," the winger said. "I want to play well and give my input into the team - I feel like I'm doing that.
"The penalty came from my cross and Felli scored from my cross. I'm delighted with that but it's a team game.
"We've got great team spirit and another two cup finals to go."
Manchester United and England footballer Ashley Young is to stand trial today accused of a speeding offence.
Young, 28, is alleged to have exceeded a 50mph limit on the M6 Toll in Warwickshire while driving a Range Rover on March 7 last year.
The former Aston Villa and Watford midfielder faces a further charge of failing to give information to the police about the identity of the driver of the vehicle.
Young, of Prestbury, near Macclesfield, Cheshire, will stand trial at Leamington Spa Magistrates' Court this afternoon.
Manchester United and England forward Ashley Young has been banned from driving for six months after he was caught driving at 100mph on a motorway in West Yorkshire.