Peralta, suffering from joint pain and a high fever, was placed on the 15-day disabled list Tuesday, but manager Joe Maddon said he thinks Peralta will be ready to come off the DL when he is eligible on Monday.
"Peralta-itis is dissipating," Maddon said.
It was thought that Peralta might have contracted the mosquito-borne chikungunya virus while in his native country, although Peralta said Friday that he doesn't know if that was what he had.
"They ran a bunch of tests when I got back here in St. Petersburg a couple of days ago, and everything came out normal, really good," Peralta said. "So I'm not sure what it was.
"Nobody knows. I'm just glad that I'm healthy."
Peralta threw a bullpen session at Tropicana Field on Friday afternoon, and he will likely head to the Minors for a short rehab assignment over the weekend. Peralta said he needed to throw one or two innings to avoid going too long without facing live batters.
David Adler is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.