The club has awarded the long-term contracts to ensure it has the stability necessary to achieve consistent success in the Premier League and European club competition.
Mike Ashley and his board have demonstrated their faith in Alan and his staff, and today's announcement sends out an emphatic message that the stability of the coaching team is key to moving the Club forward.
Managing Director Derek Llambias said: "If you look at clubs like Manchester United and Arsenal, Sir Alex Ferguson and Arsene Wenger have shown that stability gives you the best platform to achieve success, and that is the model we wish to emulate here.
"We're looking to build on the success we had last season and these new contracts are aimed at keeping the Club progressing on and off the pitch, as we have done since returning to the Premier League in 2010.
"Alan has done a fantastic job over the last couple of years and has proved what a great Premier League manager he is. I have total respect for him in all football matters and have an excellent relationship with him which I think benefits the club enormously.
"We hope this announcement will be great news for the fans, whose support and commitment to this club over the years has been fantastic."
Back in June 2012, Chief Scout Graham Carr, who has been instrumental in bringing a number of the current squad to the Club, was also rewarded with an eight-year contract.