Marshall has performed well since being dropped to Triple-A Reno, not allowing a run in two appearances. Diamondbacks manager Chip Hale said Marshall likely would return to the team once he clears the 10-day period after being optioned.
"As you guys have seen, our bullpen is a little bit in flux right now," Hale said. "We're trying to figure it out. So if he's pitching well down there, he'll probably be an option for us to go get."
Nuno, who made 31 starts between the Yankees and Diamondbacks last season, was 3-2 with a 3.23 ERA and 37:5 K:BB ratio in 39 innings over six starts with Reno. Marshall delivered a 6.08 ERA and 7:5 K:BB ratio in 13 1/3 innings before being sent down.
Marshall gave up a walk-off home run to Dodgers catcher Yasmani Grandal on Sunday and allowed two earned runs on three hits in two-thirds of an inning Saturday.
"It's a guy that we need to get right," Diamondbacks manager Chip Hale said. "It's important to our bullpen. We're going to probably bring him back, pitch him a little earlier in the game and try to make sure that he can be consistent."
Marshall had a strong rookie campaign in 2014 but is currently carrying a 7.59 ERA.
Marshall (0-1) surrendered a first-pitch home run to the first batter he faced to tie the game.
"It was a first-pitch fastball to (Joc) Pederson," Marshall said, per MLB.com. "He'd been struggling all night, but he got all of that one. The pitch had a lot of movement on it, but it was definitely down the middle. He's a dangerous hitter and you can't make mistakes like that to a guy with that kind of ability."
Marshall delivered a 2.74 ERA and 54:17 K:BB ratio in 49 1/3 innings last year, but he's struggled over the first month of the new season.
"Last year I was able to keep the ball down and especially make better pitches with two strikes," Marshall said. "That's what I'm looking for is that strikeout when I have the count in my favor. The stuff feels great. My velocity is good, the health of my arm feels good. I just need to read the hitter and make a better pitch. That's really all I can say."
Manager Chip Hale isn't losing confidence in the reliever despite his 7.45 ERA and 6:5 K:BB ratio in 9 2/3 innings, as he believes Marshall can return to the pitcher he was last year.
"We have to get him back to that," D-backs manager Chip Hale said. "He showed some pitches that he is, and then leaves a couple of balls up. We trust him in that spot. We're going to keep throwing him out there and he'll get better, I'm sure of it."
Despite Hale's confidence, the manager said Sunday that he'll likely begin to use Marshall earlier in games in order to help get him back on track in the lower-pressure situations, the Arizona Republic reports.
"He could be a candidate for that if Zieg and Addison aren't ready for Opening Day," manager Chip Hale said. "If we need somebody, he could always fill in."
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