The Cubs pitching staff is about to get some reinforcements.
Not that they really need it right now — Cubs pitchers entered Sunday with a 1.80 ERA in the last 10 games, the best mark in the league in that span by a wide margin (the Pirates were next-closest with a 2.30 ERA).
But they're about to add two of their most important arms to that group, as a pair of veteran southpaws could return from injury as soon as this week.
Jon Lester threw a simulated game Saturday at Wrigley Field and Mike Montgomery is set to make his second rehab start Monday with Double-A Tennessee.
Lester (hamstring) threw 45 pitches Saturday and reports were all positive as he showed up to the ballpark Sunday. He will throw a bullpen either Monday or Tuesday and then the Cubs will reevaluate from there.
There's no specific timetable, but the Cubs have not yet announced a starter for Thursday's game against the Dodgers and acknowledged Lester could slide into that spot.
"He's looking good," pitching coach Tommy Hottovy said Sunday morning. "We're just still taking it day-to-day to make sure there's no setbacks, he's recovering the way he wants to recover and that everything's on track. He's such a tough guy and competitor — he wants to be out there as soon as he can.
"We got a couple more days to make sure he gets through the bullpen, gets through all the things he wants to get through the next few days, but hopefully we'll be seeing him here pretty soon."
Lester last pitched on April 8 during the Cubs' home opener. If all goes well with his bullpen in the coming days, he wouldn't need a rehab stint to get back up to speed.
Meanwhile, Montgomery (lat) threw 27 pitches with Class-A South Bend last Wednesday and has been working out with the team in Chicago over the weekend. He is expected to throw about 3 innings with Tennessee Monday.
"I felt really good after my last outing," he said. "Even better the last couple days. It's a change and adjusting some of the things I do to prepare — throw/workout-wise to get me feeling right.
"...It's really fun just to go out there and compete. When you're away from it, you kinda miss it and you get that itch to be, 'OK, I gotta do whatever I can do to get back healthy and be effective.' That's where I'm at."
Montgomery knows he's facing minor-league hitters, but he's treating it like a big-league appearance, trying to get himself on track mentally as well as physically.
He dealt with some shoulder inflammation at the beginning of spring training and he felt like that set him back in terms of getting up to speed and building up strength before the season.
Montgomery only made 4 appearances before hitting the disabled list, allowing 5 runs on 8 hits in 2.2 innings.
"I feel like I've been playing catch-up so far this year and I haven't been able to get out there and really work on certain pitches in certain zones — working on my cutter/slider and getting that a little sharper, working on curveball command where I can throw it early in counts or bounce it," he said. "That's been missing and so the last week or so, I've gotten back to that.
"...If you're dealing with things physically, it's really hard to work on stuff and perfect the mechanical side of the game. I know with all the tech nowadays, you can shape your pitches the way you want and work on pitches to one side of the plate and the other.
"When you're really not feeling good, it's more of 'how can I just get through this?' as opposed to really working on stuff. I think I'm at a point where I can really work on stuff and that's a good place to be."
Only Kyle Hendricks, Jon Lester and Jose Quintana have thrown more innings for the Cubs than Montgomery over the last three seasons, as he's made 33 starts and 53 relief appearances.
Montgomery said he hasn't had any conversations with Joe Maddon or the Cubs about a change in role when he returns, but assuming he slides back into that swingman role, this time off will allow him to build up strength and get stretched out.
He also has a new perspective on life as he and his wife, Stephanie, welcomed their first child early Tuesday morning — a boy named Max. Both sets of grandparents have been in town to help take care of and celebrate the newborn, so Montgomery has also been able to enjoy time with his family and work his rehab activities around that.
"It's been a whirlwind, to say the least," Montgomery said. "But I love it that way. My wife's awesome — she's able to handle the stress of baseball and having a baby. We're still in good spirits; the family's out here helping her out.
"Going home the last couple nights makes you get a little emotional, but at the same time, it makes you really understand what is important. For me, I think that's just me being good at my job of pitching and taking care of the family.
"That's where I'm at, so it's a good experience to have and we're gonna take it from here."
The Cubs will also have options for the bullpen beyond Montgomery, as both veterans Xavier Cedeno and Tony Barnette are on the recovery path from their respective injuries. Cedeno made his second rehab appearance with Double-A Tennessee Saturday and Barnette will throw his first outing with Triple-A Iowa Sunday.Click here to download the new MyTeams App by NBC Sports! Receive comprehensive coverage of your teams and stream the Cubs easily on your device.