Northampton Saints have announced that Jamie Gibson will be joining the club from Leicester Tigers next season.The 24-year-old back-rower joined Tigers from London Irish in 2013 and has made 42 appearances for the club, scoring four tries, as well as picking up the supporters' Newcomer of the Year award in 2013/14.   Northampton director of rugby Jim Mallinder said: "Jamie has shown repeatedly at London Irish, Leicester and in England representative teams that he is a player with a big future, and we're delighted that he has put pen to paper to join the Saints.”