Pogba has emerged as one of the best young players in world football after deciding to quit Old Trafford in 2012.
"Pogba is one of those players who leaves you speechless," Buffon told TV show Tiki Taka.
"When he came we didn't know him but after only three or four training sessions we were impressed by his enormous qualities.
"My team-mates and me looked at each other as to say 'Are they blind in Manchester?' (to let him go away)."
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