McGuigan, 22, joined the Falcons’ Academy as a teenager and signed his first full-time contract with the club at the age of 18 after graduating from the Gosforth Academy AASE Scheme.
Since signing that first contract, he has been afforded many first team opportunities and has made a total of 59 first team appearances for the club to date.
Speaking of McGuigan’s departure, Falcons Director of Rugby Dean Richards said: “We are bitterly disappointed that George has chosen to leave the club where he began his professional rugby career.”
“Over the last few years we have invested a great deal into George’s development and had high hopes for his future progression at the club and his development into an international player, so it is disappointing to hear that he no longer wishes to be part of what we are building at Newcastle Falcons.”
“Having already made over fifty first team appearances, we would have expected George to continue to gain valuable experience by playing regular Aviva Premiership Rugby and enhance his international prospects.”
“While it is a shame to see that development at Kingston Park cease, the vacancy will open opportunities for others to grow here at Newcastle as Mark Wilson and Scott Wilson have done.”
“These two players have represented England against the Barbarians and at Saxons level respectively and alongside Sinoti Sinoti and Juan Pablo Socino, have enjoyed international recognition based on their performances here.”
The 25-year-old Brady has made more than 100 appearances in six seasons with the Sharks since making a try-scoring debut against Newcastle Falcons in September 2010.
Tigers director of rugby Richard Cockerill said: “Tom has a lot of ability in the wide channels and has a decent try-scoring record. We think he can kick on again at Leicester and look forward to welcoming him during the summer.”
Tigers have also confirmed the addition of Australia international Matt Toomua and South African World Cup winner JP Pietersen to the backline ahead of the 2016/17 season, while Jono Kitto, George Catchpole and Jack Roberts have today agreed new contracts.
Brady said: “As a local lad, playing for Sale Sharks has been a dream come true, I have loved my time at the club. However, the opportunity to play for one of the biggest clubs in Europe doesn’t come along every day and I’m massively excited at the prospect of joining Leicester Tigers next season. The quality of squad they are assembling and the drive for trophies is something I’m looking forward to being part of.”