"My understanding, they've got a 26th guy over there, too," McClendon said before the game. "We don't know their plans yet, either."
Ramirez began the season in the Mariners' rotation, going 1-3 with a 6.75 ERA and 1.58 WHIP before being optioned to Class A Advanced High Desert on April 24. The 24-year-old Nicaraguan made one start with the Mavericks before making another with Triple-A Tacoma.
Right-hander Arnold Leon (2-1, 4.34 ERA) joined the Oakland clubhouse from Triple-A Sacramento on Tuesday, but A's manager Bob Melvin planned to wait until Wednesday to reveal his Game 2 starter. Dan Straily (1-2, 5.01 ERA), who gave up three runs over six innings against Seattle on April 5, will oppose Hernandez in the opener.
Alex Espinoza is an associate reporter for MLB.com.