Morrison was placed on the 15-day disabled list prior to Sunday's game against the Padres, with reliever Ryan Webb recalled from Triple-A New Orleans. The 24-year-old Morrison is suffering from inflammation in the knee.
"We're going to try to rest it," the outfielder said. "If that doesn't work out, then surgery is the next step."
Morrison hopes to avoid surgery, but admits it is a realistic possibility. If he does need to undergo a procedure, he could miss the remainder of the season.
"Rest and rehab and we will see how that goes," Morrison said of his plan going forward. "We can start to build up activity, and if it's pain free, then we will go back to playing. If it's not, then we'll look to have surgery."
Morrison had surgery in the offseason to deal with the same right knee issue, but he feels he may have rushed back too quickly and that contributed to his knee problems this season.
"It's been this way the whole year," Morrison said. "I've been grinding it out, but obviously I wasn't doing anything to help the team win, so they had to make a decision."
If Morrison's knee does not improve over the next two weeks, Marlins manager Ozzie Guillen would like Morrison to have surgery as soon as possible to avoid a similar issue next year.
"If you have a problem, I don't want you to wait 'til February to get it fixed," Guillen told The Palm Beach Post and The Miami Herald. "You get it done now and move on."
Morrison was part of a team of big leaguers who played in the Taiwan All-Star Series in the offseason, but Guillen believes allowing him to take part in that exhibition was a mistake.
"In the past, they do stupid [stuff] here," Guillen said. "They let him go to Asia and play and have his surgery knowing Spring Training is coming up. It ain't going to happen again. They worry about more [stuff] off the field than worry about what happens here. I think it's more important, the Miami Marlins, than the USA team, or whatever he was doing. I think they knew he had this problem during [last season]. I'm not going to blame anyone, but think about it. There's a lot of [stuff] we've got to clean up, and that's my job."
While Morrison has never been one to make excuses, he has struggled offensively for most of the 2012 season. The left fielder, who has hit just .116 since the All-Star break, is batting .230 with 11 homers and 36 RBIs on the season.
"This whole year, it's never been 100 percent," Morrison said. "It's never been 80 percent. Running and jogging bothers it. It's a daily grind to get it ready to go. It affects me swinging and throwing. It's definitely been a grind."
David Villavicencio is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.