Cubs' Kris Bryant sits after aggravating shoulder on swing Monday night

CHICAGO -- Cubs third baseman Kris Bryant was out of Tuesday's lineup due to continued soreness in his left shoulder.

Joe Maddon said Bryant also will sit Wednesday, but the Cubs manager doesn't believe a second stint on the disabled list is needed just yet.

"Rest is the best thing for him right now, but we're not necessarily ready to do that," Maddon said Tuesday, before the Cubs 5-1 loss to the Arizona Diamondbacks.

Bryant, 26, originally hurt his shoulder on a slide and did not play between June 22 and July 11 because of it.

He has started nine games since coming off the DL but now needs more rest after aggravating his shoulder on a swing Monday night.

"He's sore," Maddon said. "I have to be proactive with that. I want to make sure that we're not pushing him too hard right now."

In other injury news, closer Brandon Morrow said before Wednesday's game that he will not be ready to be activated from the disabled list when he is eligible Saturday because he still has pain in his right biceps.

Morrow said he is progressing and the pain is a fraction of what it once was. He has not picked up a ball yet, however.

The Cubs received better news on right-hander Yu Darvish (elbow), who threw 16 pitches in the bullpen on Tuesday with team brass looking on.

"Went well," Maddon said. "No real horrible discomfort, so that was a positive.

Maddon indicated the team would re-evaluate the next step for Darvish on Wednesday, with the presumption that he will throw a more extended bullpen session in the coming days.