The Polish gloveman spent about five years at Parkhead and endeared himself to Hoops fans but Goram believes that he wasn't up to scratch, labelling him as 'dodgy'.
"It was always their Achilles heel," wrote Goram in his column for SunSport.
"A weakness you could exploit time and again.
"For as long as I can remember, Celtic and dodgy keepers seemed to go hand in hand.
"Harsh? Some will say it is. But ask yourself this... who was the last Celtic keeper you could have honestly labelled world-class?
"Don't make me laugh. The big Pole chucked too many in and made too many mistakes for him to be put in that bracket."
He added of Forster: "For over a year Forster has been tremendous. He should have been at the Euros with England in the summer.
"It was a scandal he was overlooked.
"But if he keeps churning out displays like the one he produced in the Nou Camp (against Barcelona) on Tuesday he won't be overlooked for much longer."