The club is also expected to activate second baseman Robinson Cano from the 10-day disabled list prior to Tuesday's 4:05 p.m. PT game against the Nationals, but that move has not been announced yet, as Cano isn't eligible to come off the DL until Tuesday.
Since setting their Opening Day roster 50 days ago, the Mariners have made 79 transactions involving their 40-man roster. While getting off to a 20-25 start, Seattle has used 42 players on its 25-man roster in the first 45 games of the year, most in the Majors. That includes an MLB-high 11 different starting pitchers.