White Sox right-hander Nate Jones, who hasn’t pitched since April 3 because of a sore lower back, will have a minor procedure Monday that should allow him to begin throwing in a month, the Sox said Saturday.

The mini-discectomy, an out-patient operation, shaves part of the disk material that is pressing on a nerve root or spinal cord.

“Fortunately, it’s not a season-ending thing,’’ manager Robin Ventura said.

Jones, a candidate for the closer’s job during spring training, started late because of a left gluteus strain. The issue worked its way into his hip before an MRI showed the source of the problem is in his lower back.

Sierra claimed, joins club

Outfielder Moises Sierra was claimed on waivers from the Blue Jays and will join the club Sunday. The Sox had recalled left-hander Frank De Los Santos from Class AAA Charlotte as an extra arm for one game to protect a heavily used bullpen, then sent him back after the 2-0 loss Saturday to the Indians.

Sierra, 25, was designated for assignment Thursday after going 2-for-34 with the Jays. He batted .290 with a home run, triple, 13 doubles and 13 RBI in 35 games for the Jays last season. Center fielder Adam Eaton went on the 15-day disabled list with a strained right hamstring.