Robbie Russell, D.C. United’s starting right back, will miss at least a month after tearing tissue in the bottom of his left foot.

Russell, who has started 16 of 19 MLS regular season matches, was injured late in the first half of a 4-0 away loss to the Houston Dynamo on Sunday.

“I would think somewhere in the month-plus region,” Coach Ben Olsen said Thursday.

This week Russell was fitted with a walking boot and won’t begin rehabilitation for one or two weeks.

Russell, 33, has had issues with plantar fascitis, an inflammation in the bottom of the foot, but this was the first time he suffered a tear.

In Russell’s absence, second-year Chris Korb, who has made seven starts as an outside back, will join the starting lineup Saturday against the Columbus Crew in Ohio — his first starting assignment since May 26.

“It’s always a difficult spot as a young guy to be in and out of the lineup,” Olsen said, “but he’s a gamer and he’ll be fine.”

Korb lacks Russell’s experience but adds pace to the right flank. He replaced Russell for the last 50 minutes in Houston.