To make room for Hawkins, Bobby Cassevah was optioned to Triple-A Salt Lake.
"LaTroy is the type of guy you don't realize how good he is until he's gone," said Angels manager Mike Scioscia. "We definitely missed what he could bring to our bullpen depth, whether he was coming in [during] the middle of the game or pitching late.
Hawkins has given up one earned run in 8 1/3 innings this year. In 24 appearances against the Rockies, he owns a 1.80 ERA. He pitched for the Rockies on their 2007 National League championship club.
"We'll see what inning he comes in, but he's ready," Scioscia said "We're excited to have him back and have a different dimension to our bullpen."
Hawkins entered Saturday's game with one out in the sixth inning and pitched two-thirds of an inning of scoreless ball.