From the State Library of Victoria - this photo is only identified as 1920-1930, with Dad Brewer in the middle of the back row - but we have the following possibilities:
Peter O’Neill MAY be 3rd from the left in the middle row.
The coach could be Pat Kennelly. (Pat was definitely the coach of Yallourn in 1925 …he worked in the Open Cut and in 1925 he coached Yallourn. Pat was coach of Yallourn’s first premiership team in 1925. Yallourn defeated Warragul at Yarragon. It is said (needs further validation) that he also coached Stratford and Koroit. He was connected with Port Melbourne FC and later became a leading official of Richmond Football Club. Patrick John Kennelly went onto serve in the Victorian Upper House (MLC for Melbourne West 1938-52) and then became a Senator in the Commonwealth Parliament in 1953. He was Minister for Public Works and Electrical Undertakings in the 1940’s.)