Ciriaco was recalled from Triple-A Pawtucket to fill the roster spot opened when second baseman Dustin Pedroia went on the 15-day disabled list prior to Friday's game against the Yankees.
While he played 37 games at shortstop with the PawSox, compared to 23 at second base, Ciriaco may be utilized more at second than short due to Pedroia's absence.
"Whatever I can help the team with, I'm happy to do," Ciriaco said. "I feel more comfortable at shortstop, but the last couple years, I've been playing second and third base a little bit. I'll just do my job wherever they put me."
In 64 games with Pawtucket, Ciriaco hit .301 with four homers, 21 RBIs, 14 steals and 41 runs. He played in 31 games with the Pirates over the last two seasons, going 13-for-39 with two triples.
Ciriaco impressed Boston coaches during Spring Training this year with a .419 average, a .444 on-base percentage and a .651 slugging percentage in 26 games.
"I think he's a good little player; we'll see how it translates up here at this level," said manager Bobby Valentine.
The Red Sox will play a doubleheader on Saturday, and Valentine said Ciriaco would start one of the games.