BOSTON -- The White Sox bolstered their pitching staff on Monday by calling up right-handers Jeff Marquez and Brian Bruney from Class AAA Charlotte.

Third baseman Dallas McPherson was designated for assignment, and right-hander Lucas Harrell was optioned back to AAA Charlotte after pitching four innings of relief in Sunday's loss in Toronto.

The Sox pitching staff stands at 13, although the Sox will probably go back to 12, most likely when utility man Mark Teahen returns from his rehab assignment.

"I would rather have an extra pitcher to make sure we take care of that department, especially when we come here against this ballclub, this ballpark,'' Guillen said of Fenway Park. "You never know what's going to happen. I try to protect our guys and hopefully we don't need them.''

Bruney was 1-0 with a 1.31 ERA at Charlotte. Marquez was 3-4 with a 3.97 ERA.