 Gray won one cap for England B and scored in a 5–0 victory over Switzerland in January 1950.Gray took over Third Division strugglers Millwall as player-manager in November 1963 and despite relegation to the Fourth Division, he guided the club to successive promotions during the 1964–65 and 1965–66 seasons.A falling-out with the club's directors led to his departure from The Den in May 1966, after promotion had been secured.