The team also transferred Alfredo Silverio to the 60-day disabled list, clearing enough room on the 40-man roster for the moves.
Federowicz is a Pacific Coast League All-Star and member of the All-PCL team. In 115 games, he has hit .294 and led the team with 34 doubles, 11 home runs and 76 RBI. Guerra made 44 appearances for the Dodgers earlier in the 2012 season, going 2-3 with eight saves and a 2.66 ERA.
Ely is another mid-season Pacific Coast League All-Star and member of the All-PCL postseason team. He leads the circuit with 14 wins, a 3.20 ERA and 165 strikeouts. He made his major league debut in 2010 and is 4-11 in the big leagues since, posting a 5.35 ERA in 19 starts through 23 appearances.