In October, Saints appointed Arthur Chadwick as manager, who re-instated Harkus in the team at the expense of Campbell in November; he retained the left-back place for the rest of the season.
Described by Holley & Chalk as "a man of dynamic personality"[2] and "tremendously energetic and enthusiastic, he was a natural captain who put so much into a game that, when the 90 minutes were up, he was often all in.
"[1] Harkus featured strongly in Saints' run to their second FA Cup semi-final in two years, this time losing 2–1 to Arsenal at Stamford Bridge on 26 March 1927.
In February 1932, Southampton were facing an injury crisis with Alec Campbell, Johnny McIlwaine and Bert Jepson amongst the injured.
He then moved to Lancashire to join Southport as a player-coach, but was seriously injured in a reserve team match against Barrow, preventing him making any first-team appearances.
On the outbreak of the Second World War, he joined the Royal Air Force and, serving in the Middle East, he attained the rank of flight lieutenant.