Major League Baseball has reviewed video of Jose Valverde apparently throwing a spitball, according to a source with knowledge of the situation. The incident has been discussed with the Tigers. Valverde and the Tigers have not been given an official warning, but baseball's handling of the incident indicates a de facto warning. A video showed Valverde putting his glove, with the ball in it, to his mouth before delivering a pitch to Devin Mesoraco during the ninth inning of Sunday's victory over the Reds. "It's nothing. I never did anything wrong," Valverde said. "I put my glove on my mouth, yeah. Why? Because I sweat too much. That's it."