The statement from Barlow, Owen and Donald added: "We first became aware of Jason’s reservations a couple of years ago but had hoped that by giving him the desired time and space he may begin to feel differently.
This has not been the case and we now have to accept and fully respect his decision which we know hasn’t been an easy one.
Jason’s energy and belief in what this band could achieve has made it what it is today, and we’ll forever be grateful for his enthusiasm, dedication and inspiration over the years."