Some extra relief depth for a team that probably won’t need much. Bolton, 26, was DFA’d by the Mariners last week after opening the season in Triple-A. He has a 5.40 ERA in 33 career relief appearances for the Pirates and Mariners.

Bolton, 26, is off the 40-man roster to make room for Jesse Hahn. There could be interest on the waiver wire, but it’s just as likely — if not more so — that he goes unclaimed and remains in Tacoma.

Bolton was the lone player from Seattle’s 40-man roster exiting big-league camp in the latest round of cuts. Arroyo is one of the Mariners’ top prospects and should reach Double-A at some point in the next few months. Díaz and Medina figure to make it to Seattle at some point as emergency stopgap options.

Bolton has made 17 appearances out of the Mariners’ bullpen this season, posting a 4.34 ERA, 1.45 WHIP and a 17/9 K/BB ratio across 18 2/3 innings of work. He’ll undoubtedly get another opportunity to pitch at the big-league level before the summer is through. Jhonathan Diaz was recalled from Triple-A Tacoma in a corresponding move on Friday.