SAN FRANCISCO (AP) -Giants right-hander Vinnie Chulk went on the 15-day disabled list before Monday's game against the Colorado Rockies with a blood clot in his right hand.
Chulk complained of coldness in his fingers and will see a specialist for further evaluation.
``We're not going to take any chances here,'' Giants manager Bruce Bochy said. ``We're going to find out exactly what's going on.''
Chulk has appeared in 57 games and is 5-4 with a 3.57 ERA.
The Giants purchased the contract of right-hander Tyler Walker from Triple-A Fresno to replace Chulk. To make room on the 40-man roster, pitcher Russ Ortiz was transferred to the 60-day DL.
Walker had a 1-2 record with seven saves and a 4.70 ERA in 20 games for the Grizzlies.
In addition, the Giants acquired right-hander Stephen MacFarland from the Pittsburgh Pirates to complete the trade that sent Matt Morris to the Pirates on July 31.
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