Portsmouth became one of the founder members of the Football League Third Division for the 1920–21 season and Mackie was one of new manager, John McCartney's first signings.

[2] For Portsmouth's first season in the top flight, Haines was out of favour with new manager Jack Tinn who was building a team for the future, with Welsh international Fred Cook taking over the position of inside-right.

[5] For the 1928–29 season, Mackie was re-united with his former strike partner, Willie Haines and the pair scored 26 goals between as the Saints finished fourth in the Second Division table.

[6] Mackie continued to create chances for Haines and his fellow forward, Dick Rowley, but injury kept him out of the team for long periods in the first half of next season and it was not until March 1930 that he had a sustained run of games.

[7] A similar pattern followed in 1930–31, only appearing in the opening game (a 5–0 defeat at Preston), until, after several players had been tried at inside-right, including Laurie Cumming and Bill Fraser, he was recalled to the side in January 1931.