HOUSTON — Reinforcements are coming.
The change of the calendar to September means clubs can expand their rosters from 25 to 40 players for the remainder of the season.
The Mariners are likely to add players in two waves — on Tuesday and Sept. 8, which is the day after Triple-A Tacoma completes it season.
"I’m not sure what we’ve got coming yet," manager Lloyd McClendon said prior to Monday’s series opener against the Astros.
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"I’ll sit down and finalize all of that with Jeff. There’s a chance we may have some guys here (Tuesday)."
Four players loom as strong possibilities to be part of the first wave:
***Outfielder Stefen Romero, 26, is batting .292 in 116 games with 17 homers and 79 RBIs. He’s hitting left-handed pitchers for a .314/.340/.529 slash.
***Utilityman Shawn O’Malley, 27, was in line for a promotion in early July before suffering a broken thumb. A switch-hitter, he is batting .293 in 91 games and has 10 hits in his last four games.
***Right-handed reliever Jose Ramirez, whom the Mariners obtained from the Yankees with outfielder Ramon Flores in the July 30 trade for outfielder Dustin Ackley. Ramirez, 25, has given up 13 runs in 13 innings at Tacoma.
***Right-hander reliever Tony Zych, who has 21 scoreless outings in 22 appearances since mid-June at Tacoma and Double-A Jackson. Zych, 25, spent the previous four seasons in the Cubs’ organization.
Neither O’Malley nor Zych are on the 40-man roster, but the Mariners have two openings after trading Austin Jackson to the Cubs.
Other promotion possibilities include catcher Mike Zunino, shortstop Chris Taylor, outfielder James Jones, and pitchers Mike Montgomery, Danny Farquhar, Lucas Luetge and Tyler Olson
Zunino and Montgomery can’t be recalled until after Tacoma’s season ends.