Bluebirds boss Dave Jones even remarked last week that Ramsey, who has recently been named in John Toshack's senior Wales squad for the first time, would not look out of place alongside the likes of Cristiano Ronaldo and Wayne Rooney at Old Trafford.
And his sentiments have been echoed by Scotland international Rae, who is confident Ramsey's first final will not be his last.
"Rambo is going to go on and be one of the best midfielders in this country," he said. "He has so much quality for a lad of 17. He would have been the youngest player to ever win an FA Cup if we had won it so it just shows you how mature he is as a player. He is an absolute quality player. If he keeps his head down - which he does, he works hard - he will be in plenty more finals."
The teenager was given his chance as a 60th-minute substitute and could have even made himself the hero when presented with a chance late on.
"Obviously I'm disappointed because we felt we could win the cup," Ramsey said. "It's always hard to come off the bench but I thought I settled in all right. We just couldn't push on that bit extra and get the goal."