Atlanta optioned Lee to Triple-A Gwinnett on Sunday.
The left-hander has been an effective bullpen piece for Atlanta this season with a 2.06 ERA, 1.19 WHIP and 47:14 K:BB across 43.2 innings, but he'll be the odd man out Sunday to create roster space for the return of Max Fried (forearm), who was activated from the injured list ahead of his start Sunday against the Marlins. It should only be a matter of time before Lee is back in the big leagues.