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The Giants placed right-handed reliever Santiago Casilla on the disabled list with a strained right hamstring on Thursday morning, the team announced on Twitter.
Right-handed reliever George Kontos was recalled from Triple-A in a corresponding roster move.
Casilla, 33, was helped off the field in the ninth inning of the Giants' 5-1 win over the Rockies on Wednesday night when he legged out a ground ball to shortstop. It was Casilla's fifth career plate appearance and manager Bruce Bochy reportedly told his reliever that he did not have to swing the bat.
[RECAP: Casilla, Cain injured in victory]
But Casilla, who recorded his lone career hit in one of three 2012 at-bats, swung at a 3-2 offering from Boone Logan and was fast out of the box on a ground ball to Troy Tulowitzki. After hitting the bag at first, he fell into a headlong slide and writhed in obvious pain.
“Casilla’s value to this team is very underrated," Hunter Pence said after the game. "He’s huge for us, especially with all the tight ballgames we play."
Casilla had been authoring a strong season for the Giants, allowing four earned runs in 26.1 innings of work for a 1.37 ERA and a 1-1 record.
Kontos, 28, has appeared in one major league game this year, giving up three hits in two innings of scoreless work. In 14 Triple-A games, Kontos was 0-2 with a 3.80 ERA and 35 strikeouts to three walks.