Pedro Ciriaco, 26, will get a firsthand look at the storied rivalry this weekend at Fenway Park.
After the Sox placed second baseman Dustin Pedroia on the 15-day disabled list with a right thumb sprain Friday, Ciriaco was promoted from Triple-A Pawtucket.
"I'm excited to be here," the soft-spoken Ciriaco said. "I'll try to have fun and play the game and enjoy my time."
Ciriaco hit .301 with 13 doubles, 2 triples, 4 homers, 21 RBIs, 41 runs, 6 walks and 14 stolen bases in 64 games with the PawSox.
"I've been working and trying to be ready to be here," he said.
With the PawSox, Ciriaco played mostly second and short with a little time at third. Red Sox manager Bobby Valentine knows Ciriaco is ready to play anywhere he's asked.
"However I can help the team," Ciriaco said.
Ciriaco signed with the Red Sox as a minor league free agent in December. He made his major league debut with the Pittsburgh Pirates in 2010, and hit .333 with 3 doubles, 2 triples and 7 RBIs in parts of two seasons.