Ulises Segura, shown at right in Saturday’s match at Real Salt Lake. (Scott G Winterton/Deseret News via Associated Press)

D.C. United’s Ulises Segura is likely to miss six to eight weeks after spraining the medial collateral ligament in his right knee near the end of Tuesday’s workouts at the RFK Stadium training grounds. Additional details are expected Wednesday.

He received medical attention for several minutes before leaving the field under his own power. He punched a retaining fence in frustration as he walked away.

It’s been a tough 24 hours for Segura, who on Monday learned that he had not been selected to the Costa Rican national team heading to Russia this summer for the World Cup.

Segura, 24, has started seven of eight matches and scored the only goal in United’s only victory, last month against Columbus in Annapolis. He is a defensive midfielder who started on the right wing Saturday in a 3-2 defeat at Real Salt Lake.

He becomes the third member of the central corps sidelined by injury, joining Russell Canouse (knee) and Junior Moreno (hamstring).

On the recovery timetable, Segura is probably going to miss six league matches, plus at least one U.S. Open Cup game, and return to the game-day roster around the time of the Audi Field opener July 14.

Canouse is getting closer to full strength after suffering a setback in his recovery from the preseason injury. Moreno, who has missed four of the past five matches, will accompany the team for a two-game, West Coast swing starting this weekend but probably won’t be in uniform until May 26 at Los Angeles FC, at the earliest.

>> While the pursuit of Wayne Rooney continues, United is also targeting a young South American player to sign this summer.

No details were offered by a source familiar with the team’s plans, but if a deal is struck, the player would become a young designated player. Each team is allowed three DPs; Paul Arriola is United’s only current one. Rooney would become one, as well. A young DP is age 23 or under and does not count as much against the salary cap as a senior player.

>> United has also taken some interest in Angel Rangel, an out-of-contract right back from Swansea City, the relegated Premier League club owned in part by United investor Jason Levien. The Sun’s Phil Cadden was first to report D.C.’s interest. The Spaniard, 35, has been with Swansea since 2007 but, because of several injuries, appeared in just four league matches this season.

>> Ben Olsen declined to offer any updates on the club’s talks with Rooney. The coach did, though, offer his thoughts on the mixed reaction from media and fans to United’s interest in the English superstar.

“I have enough on my plate to not focus too much on the polarity of the whole situation. It has come to me through a few people that there is some positive and negative spins to the whole thing. I don’t really give a [hoot] what the media has right now. It’s their job to live in this hyperbole world.

“If that guy came to our team, I’m pretty sure he’d be pretty good. I think he’d do just fine.”

On the social-media culture, Olsen added: “The hyperbole of everything is just unbelievable. The lack of reality and just stepping back is hard to do right now for a lot of people. I live in reality right here every week and we’re going to continue to try to make this team better with some additions. That you can bank on. Who it is, we’ll continue to try to find that out.”

On getting ambushed by TMZ Sports at Reagan National Airport last Thursday, Olsen said: “That was a first. I suppose I won’t get caught off-guard again.”

>> Olsen, on the red card given to left back Joseph Mora, a decision that left United shorthanded for almost 70 minutes: “It could’ve went either way. That is the difficulty of this [replay] stuff, because now they get to slow-mo what traditionally is a yellow card.

“In the game, he got it right — the ref was right there. He gives a yellow because it’s a tough challenge from Mora. But when you slow-mo it, now you see some studs on an ankle. They have to step in. My problem a little bit is that it’s another guy’s judgment in the booth and there’s no consistency. I’ve seen those week in and week out where they are yellows and sometimes they are reds.”

>> United (1-5-2) will fly to the Bay Area on Thursday ahead of Saturday’s match at San Jose, then travel to the Los Angeles area for a week of training at UCLA before the LAFC game the following weekend at the new Banc of California Stadium. Between 20 and 22 players will make up the travel delegation.

More soccer coverage:

Rooney and United are inching closer to a deal

Rooney has more Twitter followers than all of D.C.’s sports stars. Combined.

As World Cup nears, injuries to Neymar, Cristiano Ronaldo and others shift into closer focus