Saracens have agreed a deal for England Under-20 prop Mako Vunipola.

The Bristol forward made his international debut last year and his form has attracted interest from a number of Premiership clubs.

Vunipola, 20, helped England win the Grand Slam this year and has scored five tries in 33 appearances for Bristol.

Director of rugby Mark McCall said: "Mako is already rated as one of the outstanding players of his generation, and he has been actively pursued by many Premiership clubs.

"We are delighted he has chosen to join Saracens, and we look forward to helping him fulfil his immense potential, on and off the field."

Vunipola said: "I have enjoyed my time at Bristol, but the opportunity to join one of the top clubs in the country is very exciting.

"From the unity and spirit within their squad, from the unique way they look after players and families, and from the way they are developing so many young English players, everyone can see there is something very special happening at Saracens and I am looking forward to being part of it."