After missing 19 games with a torn right hamstring, Griffey played in Wednesday’s 8-7 win over San Francisco, but he left the game when his hamstring tightened in the fifth inning.
He did not start Thursday, but struck out as a pinch-hitter in the eighth inning of the Reds’ 12-3 rout of the Giants.
“It was just fun to be out there and do something,” Griffey said. “I’m just trying to keep it as warm as possible.”
Larkin has missed the last four games with a strained oblique muscle.
With a two-run single in the eighth, Casey reached 1,000 hits for his career.
“You never think you’ll get that many hits, and when you have a good game and the team wins, it makes it that much more sweet,” Casey said.
Dunn homered for the third time in two games, tying Philadelphia’s Jim Thome for the major league lead with 32.
After winning five of seven to open their 13-game homestand, the Rockies were swept in a three-game series by the Chicago Cubs.
The Rockies blew three-run leads in each of the first two games, but failed to get anything going offensively in a 5-1 loss on Thursday.