SCOTTSDALE, Ariz. -- Giants closer Brian Wilson, having recovered sufficiently from inflammation in his right elbow, will make his Cactus League debut on Sunday against the Seattle Mariners, manager Bruce Bochy said Monday.

Before that, Wilson will test his arm one more time by throwing batting practice to teammates on Wednesday. Wilson performed that task for the first time on Sunday.

Wilson, a three-time National League All-Star, has said that he believes he can be ready to open the season on the active roster by pitching approximately 10 exhibition innings.

Also, Bochy said that right-hander Ryan Vogelsong will throw off a bullpen mound Thursday for the first time this spring. Vogelsong, San Francisco's No. 4 starter, has been stalled by back spasms.

Posey, Sanchez due back soon

SCOTTSDALE, Ariz. -- Giants catcher Buster Posey and second baseman Freddy Sanchez might be physically fit enough to appear in exhibition games by the end of the week, manager Bruce Bochy said Monday.

The catch is that Posey and Sanchez might initially serve as designated hitters. Bochy called the DH option a "very good possibility" for Posey and Sanchez.

"We want to make sure they're ready before we put them in a game," Bochy said, noting that the accelerated pace of game activity, even in an exhibition, can cause players to aggravate injuries.

Posey, who has been recovering from extensive left leg injuries, tested his mobility Monday by sliding and running around the outer edge of an auxiliary infield about a half-dozen times. When sliding, Posey hurled himself onto a special practice sliding pad and didn't wear spikes. Bochy, head athletic trainer Dave Groeschner and first-base coach Roberto Kelly, who tutors baserunners, watched Posey carefully.

Bochy said that Sanchez, who's rebounding from a dislocated right shoulder, actually might have appeared as a DH already, were it not for the back spasms that delayed his rehabilitation early last week.