Braves general manager Alex Anthopoulos told reporters Monday that Foltynewicz is "getting close to throwing off a mound" but emphasized that the team wants to remain cautious with the hard-throwing right-hander.
Foltynewicz, a first-time All-Star last season, has been sidelined since late February after initially experiencing the elbow soreness.
Anthopoulos said the Braves are "mapping out a throwing program" for Foltynewicz and that he could have been ready for Opening Day as a reliever if the team wasn't worried about building up his endurance.
The Braves open the season on March 28 in Philadelphia against Bryce Harper and the Phillies.
Foltynewicz, 27, enjoyed a breakout season in 2018, going 13-10 with a 2.85 ERA and 202 strikeouts in 183 innings, all career bests.