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"All of them, being on the 40-man roster, [still] have a chance to make some sort of contribution," Astros manager A.J. Hinch said. "On the pitching side, we're going to need double-digit number of starters just by the nature of a 162-game schedule."
Guduan had turned in some good outings in his five Grapefruit League appearances. Over 4 2/3 innings of work, the left-hander surrendered just three earned runs on eight hits. He struck out five and walked two.
Tolliver, who tied for the team lead with six Grapefruit League appearances, gave up seven earned runs on nine hits over 4 2/3 innings. He walked one and struck out five.
With the Astros lacking left-handers in the bullpen, Hinch said both lefties would also have their opportunities to help the club during the regular season.
"If we could configure our bullpen at some point to have multiple lefties, that would be ideal," Hinch said. "Both have promise."
Rodgers is a Houston-area product out of Richmond, Texas, and Lamar Consolidated High School. He pitched in five games last season with the Astros, including one start, posting an 0-1 record and a 15.12 ERA.
This spring, Rodgers made four appearances, yielding nine runs on 13 hits over eight innings. He posted four strikeouts to go along with two walks.
"Rodgers going down to work on a few things should help us at some point," Hinch said.
Aplin appeared in 12 Grapefruit League games this spring, going 1-for-9 with two runs scored.
Glenn Sattell is a contributor to MLB.com and covered the Astros on Wednesday. This story was not subject to the approval of Major League Baseball or its clubs.