Russell recently finished serving his 40-game suspension after allegations of domestic abuse surfaced from his now-ex-wife, Melisa Reidy.
Russell struck out in the at-bat.
David Kaplan was the first to report that Russell was in Chicago on Wednesday and not with the Triple-A Iowa Cubs.
However, some fans said they were OK with the team giving Russell a second chance.
Russell's ex-wife, Melisa Reidy, alleged physical and emotional abuse and cooperated with an investigation led by Major League Baseball.
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Russell hadn't played for the Cubs since September 19. "Better relationships and communication with my teammates and family and friends". "I'm continuing my therapy, and I know I'm making great strides".
"What I do want to say is, I am accountable for my past actions", Russell said then. "Good or bad, I think, in my mind, it's going to be a positive reaction because of how hard I've worked to get here".
Epstein revealed that before deciding to tender Russell a contract for 2019, he sought numerous experts who unanimously said a zero-tolerance policy wasn't effective under the circumstances.
As the front office boss stresses, there is still a long road ahead for Russell as he continues to clean up his image.
Manager Joe Maddon said he welcomed Russell back with a hug.
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Teams that have an incredible low block, that means 11 playing in the [penalty] box: how we attack them. It was: 'Aah, it will be so hard .' Not [nervous] now, no way.
During a media briefing in the dugout after batting practice, Russell's answers were more spontaneous and without the pauses he displayed in his first media gathering in February at the Cubs' spring training facility in Mesa, Ariz. "I think I can help out with that from a baseball standpoint".
"To try to say one part is harder than the next is nearly really impossible to say because this process has been difficult and hard on my family, but also myself", Russell said.
Last week Russell, 25, said he was focused on "trying to become a better person".
Montgomery, 29, was placed on the injured list on April 6 with a mild left lat strain after allowing five earned runs in 2.2 innings pitched (16.88 ERA) in four relief outings with the Cubs to start the season.
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