Diamond, 29, had appeared in only a single game for Toronto, surrendering three earned runs in one inning. That represents his first big league action since 2013, when Diamond wrapped up a three-year run with the Twins. Over 343 innings with Minnesota, all as a starter, Diamond worked to a 4.43 ERA with 4.2 K/9 against 2.2 BB/9.
The Jays had been using Diamond as a starter at the Triple-A level prior to his call-up. Over a dozen starts, he compiled a 3.16 ERA while striking out 4.5 and walking 1.7 batters per nine innings.