The Argonauts failed to improve upon their 9–9 record from 2017, losing their tenth game of the season to the Calgary Stampeders on September 28.

Following their week 17 loss to the BC Lions on October 6, the Argonauts were the first team eliminated from post-season contention.

[2] Trestman was relieved of his duties the day following the Argonauts' 24–9 loss to the Ottawa Redblacks on November 2, following a 4–14 season with minimal success in Ricky Ray's absence.

[9] [10][11] The Toronto Argonauts lost their starting quarterback, Ricky Ray, due to a serious neck injury in the team's 41–7 loss to the Calgary Stampeders in the second week of the season.

[13] At the time of injury, commentators suggested that the team bench Ray in favor of their newly acquired backup quarterback, James Franklin.