South Sydney Later in the same year he'd made his rugby union representative debut, he crossed over to the professional code, joining the
South Sydney Club in 1910 as their first grade player number 42. He represented for
New South Wales in 1911 and was chosen for the
1911–12 Kangaroo tour of Great Britain. Gilbert made his international league début in the first Test at Newcastle in November 1911, becoming the 16th ever Australian dual code international. He played in all three Tests on tour, heading the tour's try-scoring list with 20 tries.
Hull FC From 1912 to 1915 he played in England for
Hull FC, where he played at , wearing number 4, and was
captain in
Hull FC's 6–0 victory over
Wakefield Trinity in the
1914 Challenge Cup Final during the
1913–14 season at
Thrum Hall,
Halifax, played in front of a crowd of 19,000.
South Sydney (rejoin) After the outbreak of
World War I, the
three-quarter returned to Australia, where he rejoined South Sydney. In 1916, Gilbert joined
Eastern Suburbs. He was a member of that club's
City Cup winning side before joining the
Western Suburbs Magpies in 1917. He played with them until 1920, helping to mould them from a struggling side to a competitive outfit.
St George In 1921 aged 33, Gilbert signed on as foundation captain-coach of the newly formed
St. George club. He retired as a player at the end of that season but coached the club until 1924.
International Gilbert returned to the Australian Test team as captain in the 2nd Test of the
Lions' 1920 tour of Australia. All four of Australia's illustrious three-quarter line of
Dick Vest,
Harold Horder,
Viv Farnsworth and Gilbert scored tries in Australia's 21–8 victory. With
the Ashes already won, Australia lost to Great Britain in the 3rd Test of the series with Gilbert captaining his country for his second and final time. ==Post playing and accolades==