"He's feeling good," Marlins manager Mike Redmond said. "He says he's ready to go, so hopefully we can keep him out there this time."
Morrison was first activated off the 60-day disabled list on June 9 and went 4-for-9 with six total bases in his first three games before tweaking his back.
"Stuff happens when you don't play for as long as I didn't," Morrison said. "I couldn't ignore it, so I got it addressed. But yesterday it felt better than the day before and today it feels better than yesterday."