Forster started his career with the Magpies in 2006 but failed to make a first-team appearance during his six years at the club, and spent the majority of the time out on loan.
Loan spells at Stockport County, Bristol Rovers and Norwich City were followed by a two-year spell at Celtic before he made the permanent switch to the Scottish side in 2012 for £2 million.
Pavel Srnicek worked with Forster and current Newcastle goalkeeper Tim Krul during his second-spell at the club during the 2006-07 season, and he believes that the new Southampton man was sold too early.
"When I joined Newcastle again in 2006, Krul and Forster looked very promising, and we all knew it. For me, they sold Fraser too early.
“They should have kept him a while longer, because now he looks like being the best English goalkeeper in the future.
“If he was still a Newcastle player, he could make the club more money or even be playing for the club," Srnicek said.
Forster completed a £10 million move from Celtic to Southampton this summer and is set to face his former team when Newcastle travel to St Mary's this weekend, in a game in which he will hope to shine.
Forster and Krul have both kept one clean sheet so far this season and will be kept busy in what should be an entertaining encounter on Saturday afternoon.
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But Srnicek feels that the pair could still be playing alongside, rather than against each other.
"Tim has done a great job as well, but having two goalkeepers like that, even if one is somewhere on loan, is important.
“One day, one of them could get injured, or a good offer could come in and he is sold.
“It was a hard thing for Forster to be sold.”
Should Newcastle have kept hold of Fraser Forster? Would he be the first-choice ahead of Krul if he were still at the club?