Before Friday's night game against the Giants, the Padres made a flurry of roster moves.
Also, reliever Miles Mikolas was sent to Triple-A Tucson, infielder Pedro Ciriaco was designated for assignment and pitcher Clayton Richard -- who needs season-ending shoulder surgery -- was transferred from the 15-day to 60-day disabled list.
Getting Alonso and Gyorko back is a big plus for the struggling Padres.
Alonso, a 26-year-old first baseman, is hitting .284/.335/.416 with six homers and 29 RBI in 54 games this season. A fractured hand had sidelined him since June 1.
Gyorko, a 24-year-old second baseman, is hitting .284/.341/.461 with 17 doubles, eight homers and 36 runs scored in 60 games this season. He has been out since June 9 due to a groin injury.
The Padres enter Friday having lost 12 of their last 13.