Chicago Cubs closer Brandon Morrow has landed on the disabled list with back spasms.

Morrow hurt himself while undressing after returning home from the team's trip to St. Louis early Monday morning.

"Just undressing at my house," Morrow said. "Like 3 a.m., in the closet, got my right leg off. Left one just felt like a spasm in my back.

"It's frustrating any time you can't get out there, especially when you can't go because of something stupid like taking your pants off."

Joe Maddon said the matchups will dictate who closes with Morrow sidelined.

"We thought it would be wise to give him a couple of days," Maddon said of Morrow. "We just can't go with one less pitcher right now. We just cannot."