While a member of the Senators during the 1911–12[1] and 1912–13 seasons Ronan was also a member of the NHA Eastern All-Stars, managed and coached by Art Ross, who played a series of exhibition games against an All-Star aggregation from the Pacific Coast Hockey Association, scoring a total of 8 goals in 9 games over two years.

Ronan played a season and a half with the Shamrocks and the rivaling Toronto club Toronto Blueshirts before being dealt to the Montreal Canadiens, playing on their 1916 Stanley Cup-winning squad, scoring a goal in the deciding game 5 2–1 win over the Portland Rosebuds.

While with the Canadiens Ronan assaulted former Blueshirts teammate Alf Skinner in a game between the two clubs on January 22, 1916, which had him arrested by police and taken to the Agnes Street station in Toronto, although he was later released on $200 bail.

[2] The incident went to trial and Ronan was acquitted of the charge on January 31 before Judge Winchester in Toronto, with Canadiens manager George Kennedy acting as a witness for the defense.

He returned to professional hockey and was re-acquired by Ottawa in a trade with the Canadiens in exchange for Harry Hyland.