CHICAGO — The Chicago Cubs have placed closer Brandon Morrow on the 10-day disabled list because of lower back tightness.

Morrow said Tuesday he sustained the injury while taking his pants off at home on Tuesday morning.

"Just undressing at my house," Morrows said of how he suffered the injury. "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.

"Getting hurt any time's frustrating, but when it's not related to throwing a baseball it's even that much more frustrating."

The closer said ideally the nature of how he sustained the injury would lead to a quick healing process.

"I'm hoping that since it's not like a trauma-induced spasm — like I wasn't throwing a pitch or lifting something or twisting — that once the muscle relaxes it should be OK," Morrow siad.

The Cubs announced the roster move prior to Wednesday's game against the Los Angeles Dodgers. Right-hander Justin Hancock will remain with the club after being called up from Triple-A Iowa as the 26th man for Tuesday's day-night doubleheader.

Signed by the Cubs after helping the Los Angeles Dodgers beat them in the NLCS last season, Morrow has 16 saves in 17 chances.

The Cubs are also missing relievers Carl Edwards Jr. (right shoulder inflammation) and Brian Duensing, who is on the bereavement list after his grandfather died on Saturday. Chicago was second in the NL Central, a half-game behind the Milwaukee Brewers.