"We're strengthening it before we start throwing," Reds head trainer Paul Lessard said. "We want to calm it down first. He's feeling much better. It will still be a few days. We want to make sure it's right before he attempts to throw."
Cueto was injured while pitching vs. the Pirates on April 13. He is eligible to be activated on April 29. Rookie left-hander Tony Cingrani replaced Cueto in the rotation.
Mark Sheldon is a reporter for MLB.com. Read his blog, Mark My Word, and follow him on Twitter @m_sheldon. This story was not subject to the approval of Major League Baseball or its clubs.