MESA, Ariz. _ Cubs relief prospect Manuel Rodriguez was scheduled to undergo an MRI on Monday to determine the extent of an injury to his right biceps.
"I feel soreness," Rodriguez said. "It's not my elbow but my biceps and forearm."
Manager David Ross said the team expects to learn results of the exam by Tuesday and described the ailment as biceps soreness.
Rodriguez, 23, left Sunday's game against the Mariners after throwing a pitch to Kyle Lewis with one out in the sixth inning.
Rodriguez, who struck out 65 in 47 innings at Class A Myrtle Beach last season, had his fastball clocked at 99 mph Thursday against the Rangers.
In other pitching news, closer Craig Kimbrel threw a bullpen session Monday and is expected to make his exhibition debut Wednesday against the Reds in Goodyear, Ariz.
