Lee was recalled from Triple-A Gwinnett on Friday.
The 27-year-old was sent to Triple-A last weekend but will quickly rejoin the big-league club with Edgar Santana (ribs) heading to the injured list. Lee has a 1.54 EA, 0.76 WHIP and 54:6 K:BB over 46.2 innings for Gwinnett this season, and he's looking to make his MLB debut.