"I will let you guys know when I'm going to play," Ramirez said. "Don't worry."
When a reporter questioned if he could play in Tuesday night's game against the Braves, Ramirez asked, "Who said that?"
Ramirez swung a bat for the first time on Monday and said he felt "good." He says he still doesn't have full range of motion.
The three-time All-Star already missed 14 games earlier in the season when he was on the 15-day disabled list with a left back sprain.
Following his exit from the game in New York, Ramirez was initially listed as day to day. He flew back to Miami before the team did on Wednesday to have an MRI exam, which confirmed the left shoulder sprain.
It is the same shoulder that Ramirez had arthroscopic surgery on after the 2007 season to repair torn labrum tissue.
"I got surgery on that shoulder, so that's what you guys have to understand," said Ramirez, who is batting .243 with 10 homers and 45 RBIs this season. "I got surgery on that shoulder and it came out. It's not going to be the same as it used to be when it used to come out.
"It used to go back in there two, three days, but now it's a different page. After that surgery, everything was tied up. I never felt this way before. I couldn't lift it and I couldn't move it. And every day, it's improving; getting better every day. And hopefully in the next couple of days, I can be in there again."
The Marlins are 48-38 when Ramirez is in the lineup.
Christina DeNicola is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.