PHOENIX -- D-backs shortstop Stephen Drew has been diagnosed with a lower abdomen strain and is listed as day to day. An MRI on Drew's abdomen Tuesday afternoon revealed the strain. It is unclear if he will be ready for Opening Day, but he is not headed to the disabled list.

Drew was originally removed from a game in the first inning on March 16 because of discomfort in his midsection and was scratched from the starting lineup four days ago because of soreness in the area. He went 0-for-1 with a walk Monday against the Rangers.

"It sounds like that after yesterday's game, he came in this morning and said he felt like he did four or five days ago," D-backs general manager Kevin Towers said before the results were revealed. "I don't think it's anything serious, but we'll know more once we get the MRI back and he sees a specialist. If nothing shows up, it might give him more peace of mind."

Towers said Tony Abreu is probably best suited to step in at shortstop in Drew's absence. It's also possible for the club to seek an infielder from outside of the organization.

Towers hopes for improvement from D-backs

PHOENIX -- D-backs general manager Kevin Towers expressed his disappointment with his club's play this spring and hopes for better results when the regular season begins Friday in Colorado.

The D-backs finished 12-25 in Cactus League play this year.

"We did some things well, but we didn't have too many clean games this spring," Towers said. "I don't know if the guys were tight because of all the competition at all of the positions but to me, it was kind of a disappointing spring. I was hoping to finish the last week or 10 days with some momentum going into the season but that didn't happen. Hopefully, once we get the 25-man roster set, some people will be at ease a little bit."

Towers said he could finalize the 25-man roster following Tuesday night's game. However, the playing status of shortstop Stephen Drew remains in question. Drew, who was diagnosed with an abdominal strain, is listed as day to day. It is unclear if he will be ready for Opening Day, but he is not headed to the disabled list.

Towers also expressed concern with the undefined roles in the bullpen and the fact that his closer, J.J. Putz, threw only 1 1/3 innings in Cactus League play. He is not interested in pitcher Carlos Silva, who was recently released by the Cubs.

"If there are people that don't buy into the program and do things like we were talking about -- throw strikes -- we'll move them out and bring people in that can," he said. "I have been very impressed with the young players we got in our system. We have some guys at the Double-A and Triple-A level that are hungry to take these guys' jobs."

Towers called himself a "realist." He said he will know if his club has a chance to contend after the first month of the season.

"I'm very curious to see how these guys respond once the bell rings," he said. "I did not like what I saw in the last 10 days of the season and I didn't particularly like what I saw in six weeks of Spring Training."

Roberts makes D-backs; Allen sent down

PHOENIX -- The D-backs could finalize their roster as early as Wednesday morning but a few questions have already been answered.

Infielder Ryan Roberts has made the team and first baseman/outfielder Brandon Allen is headed to Triple-A.

"It was a pretty tough decision," D-backs manager Kirk Gibson said. "[Allen] worked his butt off and really improved a lot. He played good first base and very well in the outfield. When you look at the kind of player you want on this team, he is one of those guys. Unfortunately, with our needs, Ryno is the guy."

The decision also means Russell Branyan and Juan Miranda will share the duties at first base.

"I think [Miranda] is better defensively than we thought," Gibson said. "He drives the ball pretty good and he's had his share of walks. He has a great attitude. It's a good situation for us. We have a lot of depth at that position."