Alvarez (illness) has appeared in Triple-A Gwinnett's last four games, going 8-for-17 with two home runs, two walks, two stolen bases, six RBI and six runs.
Alvarez has not played for Triple-A Gwinnett since Aug. 14 while battling pneumonia, Mark Bowman of MLB.com reports.
Atlanta optioned Alvarez to Triple-A Gwinnett on Wednesday.
Alvarez will start at second base and bat second Monday versus the Reds in his major-league debut.
Atlanta selected Alvarez's contract from Triple-A Gwinnett on Monday.
Alvarez is expected to be promoted from Triple-A Gwinnett on Monday, Mark Bowman of MLB.com reports.
Alvarez is expected to be called up from Triple-A Gwinnett on Monday, Mark Bowman of MLB.com reports.
Atlanta promoted Alvarez from Double-A Mississippi to Triple-A Gwinnett on Wednesday.
Alvarez, 20, has a .317 average and .496 OBP with zero home runs and seven steals through 25 games for High-A Rome.