ESPN baseball commentator Pedro Gomez reported on Sunday that Ohtani was expected to undergo surgery on his elbow that could leave him sidelined until 2020.
However Angels GM Eppler swiftly played down the reports early Monday, telling the MLB Network that there had been no change in Ohtani's condition.
The Japanese star is currently out for three weeks after suffering sprained elbow ligaments, and the club is hopeful he may respond to platelet-rich plasma and stem cell therapy.
"There have been no changes in Ohtani's diagnosis and neither our physicians nor medical staff have recommended (Tommy John surgery) or said it's likely," Eppler said.
The Angels announced on Friday that Ohtani has a grade 2 sprain of the ulnar collateral ligament in his right elbow.
The Japanese ace has electrified Major League Baseball after a string of successful performances as both a pitcher and hitter, a rare double threat that has seen him nicknamed the "Japanese Babe Ruth."
Pitchers suffering elbow injuries involving the UCL often require Tommy John surgery to repair the problem, leading to a lengthy rehabilitation.
Los Angeles Dodgers shortstop Corey Seager was ruled out for the entire season in April after undergoing surgery to repair damaged ligaments in his right elbow.