Morse returned as the Mariners' first baseman after resting a strained right quad that has been lingering for the past couple of weeks and was slotted fifth in manager Eric Wedge's lineup.
"Neither of them are 100 percent, but they're back out there, which is better than them sitting with me," Mariners manager Eric Wedge said.
Morales has hit in 29 of his last 36 games since April 30 with a .327 batting average and five home runs, while Morse is second on the team with 11 home runs.
Jeff Kirshman is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.