The giant goalkeeper will sign a four-year deal and leaves Celtic two years after joining them from Newcastle United in a £2.2m transfer. He had spent the previous two years on loan at Celtic from Newcastle before the move was made permanent.
The transfer fee represents a stunning profit for Celtic on a goalkeeper who has gone from third choice at Newcastle to one of Europe's brightest talents.
He has produced some outstanding performances in Europe over the past three seasons, most notably against Barcelona in the Champions League when he almost single-handedly defied Lionel Messi in Celtic's 2-1 win over the Catalan giants in November 2012.
His form was rewarded with a first England cap against Chile last November, and he was part of the England squad at the World Cup finals in Brazil with the national coach Roy Hodgson a firm admirer of his talents.
Some commentators said he was not properly tested in the Scottish Premiership, but his move to the Premier League provides the man nicknamed 'The Wall' by the Spanish media with the chance to challenge Manchester City's Joe Hart for the England starting jersey.
OUR VIEW: Forster has the chance to emulate the great Peter Shilton by becoming the first Southampton goalkeeper to represent England in decades. Judging by his form for Celtic in some key matches, he is ideally placed to challenge Joe Hart for the starting jersey with Hart under pressure from Willy Caballero at Manchester City. Can look forward to a larger pay packet and some meatier action in the Premier League than the less salubrious confines of the Scottish Premiership.
Not that Celtic will be left dramatically disadvantaged by his departure. They would appear to have a capable deputy in the former Sunderland and Scotland man Craig Gordon, providing he stays fit, while they also trouser a handsome profit from the transfer. Seems to be a beneficial deal for both parties.
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