Wilton Lopez tossed 1 1/3 perfect relief innings in Saturday's 10-2 drubbing of the Giants.
Neftali Feliz (elbow) is long-tossing at 120 feet.
Julio Borbon has stolen three bases since he joined the Cubs last month.
Since May 2, Ryan Raburn is batting an anemic .172/.273/.241 over 33 plate appearances.
Matt Carpenter has hit safely in all but two May games.
Huston Street earned his 10th save of the year Saturday as the Padres beat the Nationals 2-1.
Eric Stults held the Nationals to one run over eight innings to pick up a win Saturday and move to 4-3 on the season.
Yonder Alonso went 2-for-3 with a homer Saturday in the Padres' 2-1 win over the Padres.