The dull match at the Britannia Stadium looked to be heading to an insipid 0-0 draw before the Argentinian netted five minutes from time following a marauding run from his own half.
And Platt praised his player, who has become one of the Premier League’s best full-backs, insisting his professional displays are key to their success.
He said: "When you have got players of the ilk we have got - the Yayas, Silvas, Agueros, Tevezes - they all work hard and do what they have to do, but you need to sprinkle into that mix those players that often go under the radar.
"What is pleasing is that he scores a goal in a cup match and he can get some headlines, but he won't be bothered about that.
"He isn't bothered about headlines. Those kind of players aren't.
"It's not what they play for. He is an eight out of 10 man every week. For professionals he is just a top man really."