Mackay had absolved the 28-year-old of any blame in Samuel Eto'o's Stamford Bridge strike and his defiant display in Norfolk merely underlined Marshall's quality.
"He is an excellent goalkeeper. He was disappointed with what happened at Chelsea, even though he wasn't at fault, let me make that clear," said Mackay. "Here he showed what he has done for two and a half years. He is a top, top goalkeeper. He was the best in the Championship last year and he is absolutely a Premier League goalkeeper. He is a very level-headed lad. He had the crowd against him but he took that in his stride and he has done excellently since the day I came in.
"His confidence had probably been knocked when I first came here but he has done so much work with my goalkeeping coach, Jim Hollman, and he has got himself back in the Scotland squad and that is fully deserved."
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