London Wasps are eager to sign Billy Vunipola to a new deal before his contract runs out at the end of the season.
Vunipola's brother Mako made his England debut against Fiji at Twickenham and Billy is expected to do the same in the future after a series of impressive performances for Wasps this season.
Saracens have been linked to the promising youngster and Wasps boss Dai Young is eager to keep the 20-year old at the club along with other young stars including Christian Wade, Joe Simpson and Joe Launchbury.
"Billy is still 20, it's quite frightening. He's only going to get bigger and stronger," Young told The Rugby Paper.
"People seem to be bouncing off him already. I'm over the moon with him. We have to get his contract done as quickly as possible but these things don't happen overnight.
"It's that time of the year when there is huge speculation about who is coming and going. We have to work hard to keep hold of these important players. There are a lot of really good youngsters coming through and they will hopefully be the core of Wasps for many years to come. It's my job over the next couple of seasons to build the team around these players.
"If you look at the team Christian Wade has been excellent in all aspects in the last couple of games. Veryone knows what he can do with the ball in hand. Elliot Daly is there or thereabouts and is only going to get better. Joe Simpson is still quite young and has improved his game no end. We all know what a threat he is with ball in hand but his game understanding and running of the game has been far better this season."