In 1977, Coventry loaned Green to the Washington Diplomats (Dips) of the North American Soccer League (NASL), whose season ran during the summer months, or the English off-season.
At the end of the 1978-79 English season, Green left Coventry to move permanently to the NASL,[2] rejoining the Diplomats for the next two years.
Green became a prolific scorer with the Dips, finding the net 42 times in 56 games, earning NASL All-Star Honorable Mention honours for 1980.
In order to fill the roster, U.S. Soccer was forced to draw on foreign imports, and it negotiated with the Earthquakes to loan Green to Team America, despite the fact that he was still a British subject.
Once Green gained U.S. citizenship, he earned a single cap with the United States national team in a 30 May 1984, scoreless tie with Italy.