Casilla recently received his walking papers from the A’s, who’ll still pay him the $2MM or so left on his salary for the current season — less any pro-rated portion of the league minimum he earns with the Colorado organization. The 37-year-old has spent his entire career to this point with the two Bay Area organizations.
While Casilla had worked to a 3.16 ERA in his 31 1/3 innings this year in Oakland, he was carrying an ugly 22:20 K/BB ratio. He’s averaging about 94 mph on his fastball still, but the 38-year-old has also seen his swinging-strike rate drop to a personal-low 9.0%.
For now, Casilla will represent a depth option for the Rox. But he could certainly end up becoming an option at the MLB level if he shows well. Though the team has already made one bullpen upgrade, the relief unit is probably susceptible of further improvement.