 Marsh began his career with First Division side Fulham, and made his debut against Aston Villa at Craven Cottage on 23 March 1963 after Johnny Haynes picked up an injury.He scored the winning goal on his debut with a volley from a George Cohen cross, prompting manager Bedford Jezzard to state that "No boy could have had a better first game".Haynes returned to the starting line-up the next week, but Marsh was accommodated with the number eight shirt.