According to Reds beat writer John Fay, the Reds will disclose their September callup roster decisions on Friday.

The Reds will announce the September call-ups Friday. Three of them will join the club Saturday in Houston; three will join the club Tuesday.

Devin Mesoraco will be back on Sunday – the first day he’s eligible to return.

My understanding is that this does not include players on a rehab assignment (namely Joey Votto and Bill Bray.) So, Votto and Bray on Saturday with 3 minor leaguers, Mesoraco on Sunday, and three more minor leaguers on Tuesday. Tuesday is when Louisville’s season ends.

Nine players in total would be added to the current roster, which would put the September roster at 34. Jocketty said the Billy Hamilton would “probably not” be among those called up. Hamilton is listed as an outfielder for the Arizona Fall League.

“That’s part of it,” Jocketty said. “He’s going to go to the Instructional League and the (Arizona) Fall League. He needs a little break. He’s had a terrific year.”

Jocketty said Hamilton will “possibly” play other positions, i.e. outfield, in the Fall League. Hamilton has played all shortstop this year.

Candidates to be called up among already on the 40-man roster include those that have already seen major action: Todd Redmond, Logan Ondrusek, Chris Valaika, Jordan Smith.

Others on the 40-man roster include
— The entire Louisville Bats infield: Neftali Soto, Henry Rodriguez, and Didi Gregorius. Rodriguez and Gregorius have been moving around to play all the infield positions the past few weeks, including Rodriguez playing several games at shortstop.
— Denis Phipps plays all 3 outfield positions and has come on lately with a .939 OPS in August.
— Pedro Villarreal, Donald Lutz (AA), and Kyle Lotzkar (AA) round out the 40-man roster and are unlikely to get the September call in 2012.

It seems unlikely that the Reds would add anyone to the 40-man roster, though leading candidates from that group could include Willie Harris, Mike Costanzo, Carlos Fisher, Will Ohman, and Corky Miller.

My guesses for who gets the callup on Saturday is one infielder and 2 pitchers. I’m guessing 1 infielder because P.J. Phillips was promoted to AAA Louisville yesterday. Perhaps Henry Rodriguez, but that’s just a complete guess. Todd Redmond and Logan Ondrusek seem to be the best bets for immediate pitching help. Gregorius is heading to the Arizona Fall League, so it may be more likely that someone like Valaika gets the callup on Tuesday. I could also see the team bringing up Jordan Smith and adding either another outfield bat – either Denis Phipps or Willie Harris.