Blum felt a "pop" in his elbow while putting on his shirt following Thursday's contest against the Padres, according to manager Brad Mills. With the soreness continuing into Friday, Blum was evaluated at a local hospital where doctors found "loose bodies" in the elbow.
"He was putting on his shirt after the game, and his elbow goes, 'Boom, pop,' and it blows up on him," Mills said.
For now, Blum is listed as day-to-day, but prior to Friday's game, Mills said he expects Blum to miss at least a few days, and general manager Ed Wade indicated that Blum is a candidate for the disabled list.
"It's just wear and tear," Blum said. "There are probably 90 percent of us in the big leagues that have loose bodies floating around, it just so happens that after the game, it tightened up on me. The shirt had nothing to do with the [darn] injury."
The roster move that sent outfielder Jason Bourgeois to Triple-A Round Rock also has implications based on Blum's status. Should the club decide to place Blum on the 15-day DL, it could immediately bring Bourgeois back to the Majors, explained Wade.
"In the event of a DL, we can bring [Bourgeois] back at any point," Wade said. "So, he's actually not even scheduled to fly until [Sunday] and by then, we'll know more about Geoff's status."
Mills said the decision to send Bourgeios, who filled the fifth-outfielder role for the club, to the Minors was based more on needing an alternative in the infield while Blum is shut down, and playing with four outfielders on the roster presents less of a risk.
"It looks like we might not have [Blum] for maybe three, four, five days, so if we were to make the move with him, we would be down a middle infielder for four or five days," Mills said. "So we felt that we would rather go with four outfielders than not have a backup middle infielder."