PHOENIX -- MLB rosters expanded from 25 players to 40 on Sunday, and as expected, the only Dodgers reinforcements were three players who were activated from the injured list.

Right-handers Ross Stripling and Dylan Floro and veteran infielder David Freese were added to Los Angeles’ roster for the series finale vs. the D-backs at Chase Field. Stripling got the start on the mound, pitching three scoreless innings in the team's 4-3, 11-inning win, while Freese started at first base and hit a first-inning homer.

It’s likely the Dodgers will call up some players from Triple-A Oklahoma City at some point this week.

Two players who won’t be added to the Dodgers’ roster are first baseman Tyler White and left-hander Scott Alexander, as manager Dave Roberts said Sunday that he doesn’t think either player will return from injury this season.

White (right trapezius sprain) is still in “rehab mode,” according to Roberts, and he’ll likely stay at the Dodgers’ complex in Glendale, Ariz., after the club returns to Los Angeles. Meanwhile, Roberts said Alexander’s nerve damage in his left thumb hasn’t shown enough improvement for him to return.

As the season's final month begins, here is a look at how the Dodgers’ farm system has made an impact in 2019:

Arrival: Will Smith, C
He might never be the most famous Will Smith out there, but the one now starting behind the plate for the Dodgers is making the kind of in-season impact that former National League Rookie of the Year Award winners Corey Seager and Cody Bellinger made before him. Smith has displaced Austin Barnes as the starting catcher with his two-way talent that includes blossoming power.

Breakout: Josiah Gray, RHP
Turns out the Yasiel Puig/Matt Kemp/Alex Wood/Kyle Farmer trade to the Reds was more than just a salary swap. The Dodgers landed a pair of Top 10 prospects, and in-season promotions from Class A to Class A Advanced, then to Double-A this year haven’t slowed Gray’s progress as a right-handed power pitcher. Gray is the Dodgers’ No. 4 prospect.

Something to prove: Yadier Alvarez, RHP
Time is running out for Alvarez, ranked No. 2 in the system by MLB Pipeline in 2017 and no longer in the club’s Top 30. He’s pitched two games this year because of injuries and hasn’t shown why the Dodgers spent $32 million to sign him out of Cuba.

Name to watch: Jeter Downs, SS
After tearing up the Class A Advanced California League, Downs, the club’s No. 6 prospect, hasn’t slowed down since his promotion to Double-A Tulsa. He’s a middle infielder with 63 extra-base hits this year and could become the next Corey Seager or Gavin Lux.