ESPN's Jeff Passan was first to report the news. The injury will keep Syndergaard out until at least April 2021, according to Passan.
"After experiencing discomfort in his elbow before Spring Training was suspended due to the pandemic, Noah and our health and performance department have been in constant contact," Mets general manager Brodie Van Wagenen said in a statement. "Based on the persistence of his symptoms, Noah underwent a physical examination and MRI that revealed the ligament tear."
The Mets said that a second opinion confirmed the diagnosis and spurred a recommendation for the pitcher to undergo surgery.
In 2017, Syndergaard, 27, played in just seven games as he struggled with a torn lat muscle in his right arm that landed him on the 60-day disabled list.
Last season, Syndergaard went 10–8 with a 4.28 ERA and 202 strikeouts. Syndergaard, who was heading into his sixth season with the Mets, is 47–30 with a 3.31 ERA over his career.
The MLB season is currently suspended due to the coronavirus pandemic.