Soler, 23, sprained his left ankle lunging into first base in Miami on Monday, but stayed in the game. He felt the pain immediately, but said he didn't feel remaining in the game made it worse.
Before the injury, Soler batted .288 in May with two home runs and eight doubles.
"My opinion is ... 15 days," Soler said when asked when he'll be ready to play again. "I feel real good. I feel strong, too. I think I'll take my 15 days."
Jacob Emert is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.