Andy Saull will leave Saracens to join Newcastle Falcons at the end of the current season.
The England Saxons flanker, 24, has made 121 appearances for the north London club over the past six seasons, and has decided to embrace a new challenge with the Falcons.
Nigel Wray, chairman, said: “We have seen Andy develop into an oustanding young man and we are sorry to see him leave. He will always be welcome and respected at our club and we have no doubt that he will be a great asset for Newcastle Falcons.”
Saull said: “My time at Saracens has been beyond what I could have ever imagined when I first joined. The club has helped me develop as a player, and they have given me the chance to play at the highest level.
“I’m leaving a lot of great people behind at the club and some fantastic memories, but I’m really excited by what is happening at Newcastle Falcons under Dean Richards and I am looking forward to the fresh challenge.”