Hawkins amassed 15.75 ERA since joining Giants
Hawkins went on the DL, retroactive to June 10, with nerve irritation in his right elbow.
"Nerves tend to heal slowly, but we don't think this is going to be long-term," trainer Stan Conte said.
After San Francisco beat Detroit 4-0 on Friday night, Hawkins said he was concerned about his ailment.
"If your fingertips were tingling for the first time, you would be concerned, too," Hawkins said.
Hawkins is 0-1 with a 15.75 ERA in five appearances with the Giants since they acquired him on May 28 from the Cubs for right-handers Jerome Williams and David Aardsma and cash. He gave up two runs in his last outing, a 9-7 victory over Kansas City on June 9.
Puffer was 5-2 with a 3.99 ERA in 27 appearances at Triple-A Fresno. He has major-league experience with Houston and San Diego.
Copyright 2005 by The Associated Press
MORE MLB HEADLINES
- Red Sox trade Lester to A's for Cespedes
- Source: Cardinals get Lackey from Red Sox
- Athletics send LHP Milone to Twins for Fuld
- Presidential farewell: Jeter honored by Bush
MOST SENT STORIES ON ESPN.COM
- Majestic Men's Replica San Francisco Giants Tim Hudson #17 Home Ivory Jersey