Seigler is out of the lineup for Sunday's game against the Blue Jays.
Romy Gonzalez will draw the start at second base in place of Seigler, but both could be headed for bench roles after the Red Sox acquired Curtis Mead from the Nationals earlier Sunday. Though Mead had primarily been used at third base and first base with Washington, Boston interim manager Chad Tracy said that the infielder will see most of his initial opportunities at the keystone. With a .774 OPS in 29 games with the big club this season, Seigler has performed well enough to maintain at least a semi-regular role, so it's possible that he and/or Mead end up cutting into Masataka Yoshida's playing time at designated hitter.