Southampton have snapped up Yan Valery to a long-term deal, with the full back signing a new deal until 2023.
The French wing back, 20, has become an integral part of Ralph Hasenhuttl's squad since making his full debut in Mark Hughes' last match in charge, a 2-2 draw against Manchester United in December.
Valery signed from Rennes in 2015 and progressed through the club's academy. He has featured in all of Hasenhuttl's 14 games at the helm, and chipped in with two goals in his last two games - the latter coming in the vital win against Spurs last weekend.
Valery said: 'It's a big step. It proves the club believe in me, and I am really proud and happy to sign again for this club.
'It is the club that gave me my chance. This manager has given me all of his trust, so I am just happy to sign again and I can't wait now to give everything I've got to help the club stay in the Premier League and to keep working hard and improve my game and be a better player than I am now.'
Hasenhuttl cited Valery as the perfect example for young professionals to follow, saying: 'On his day off he is still here, he is still working, he is working on his deficits, on his heading or something like that. It's exactly one player we want to see in our Southampton way and we want to see him do well.'
The Austrian manager has been rewarded in the faith he put in Valery, who replaced Euro 2016 winner Cedric Soares, who is now on loan at inter Milan, in the side.
'If you want to push the young players you have to have the chance to bring them in.
For every manager there comes situations where the young players don't perform like you immediately want them to perform and then there's pressure because the other one is still here and is very good - Cedric is a good player,' Hasenhuttl said.
'So then you maybe think to take the young player out and give the other one a chance and let them wait a little bit, but it protects you from yourself from making these decisions.
'If you give the other away you don't have the chance and you force him and force him and force him.
'I may tell a young player in the week he's playing, and sometimes going to Thursday, Friday and Saturday morning and you are thinking if it's the right decision. You have come out of this because you have told him. To protect myself I do this.
'That's maybe what I did with Yan. That doesn't mean he plays every week - I subbed him for Prowsey one at Burnley so it shows there might be so many players on this position but I still have to work on my performance and still have to develop my game.'