Extra bases

• An MRI exam Monday of Cubs outfielder David DeJesus' right shoulder confirmed that it his injury was no more serious than a sprain. DeJesus was injured in the third inning Friday when he crashed into the outfield wall at Citi Field trying to make a catch.

The shoulder is still swollen, and there is no timetable for DeJesus' return. He was placed on the 15-day disabled list Saturday.

• Instead of adding another outfielder, the Cubs activated reliever Shawn Camp from the disabled list Saturday, which leaves them a little short-handed as far as position players go.

Sveum said there would be no change in the immediate future.

"Right now, it's coming in handy having that extra guy," Sveum said.

• Alfonso Soriano was visibly upset after Sunday's loss to the Mets in which Marmol blew a three-run lead in the ninth.

"For the position players in that clubhouse as well as some of our starting pitchers, a lot of our starting pitchers, it's been frustrating to beat a lot of teams and have games won after seven innings -- whatever our record is after the seventh inning -- and have a run differential of where we are," Sveum said. "It wears on you after a while as a player."

The Cubs have 21 losses in games in which they have had a lead.

• Left-handed pitcher Rob Zastryzny, the Cubs' second-round pick in the First-Year Player Draft, has apparently signed with the team. Zastryzny tweeted Monday: "Officially part of the Chicago Cubs organization. Thanks for all the support and I can't wait to start the journey. #Cubs"

The Cubs have yet to confirm any Draft signings.