Saltalamacchia had surgery on his right shoulder in September after he was diagnosed with Thoracic Outlet Syndrome, where a rib bone can push on a nerve and cause numbness in the arm and hand.
"Looks like he swung and hurt himself a bit," said Dean Treanor, Toros del Este manager, on ESPN Deportes TV. "[He had] tingling down his arm and numbing. We had to get him out of there. Hopefully he will be all right."
Rangers general manager Jon Daniels said he talked to some of the scouts in attendance and they said Saltalamacchia, 24, was throwing the ball well, but wasn't comfortable with how it felt.
"Salty had some discomfort in his arm," Daniels said. "He played it safe and came out of the game. He'll be evaluated in Texas on Friday. At this point, we don't know if it's simply part of the rehab or something else."
The uncertainty about how long it might take Saltalamacchia to return probably contributed to the Rangers' decision Tuesday to offer salary arbitration to catcher Ivan Rodriguez. The veteran catcher has until Monday at 11 p.m. CT to accept or decline it.
If he does accept, that gives the Rangers some insurance. If he doesn't, Texas would get a supplemental first-round pick.
Richard Durrett covers the Texas Rangers for ESPNDallas.com. E-mail him at firstname.lastname@example.org.