A third doctor will evaluate MRI test results for D.C. United midfielder Branko Boskovic’s injured knee, but the Montenegrin midfielder will undergo surgery for a torn ACL soon and miss four to six months, club officials said Tuesday.

Because of the unique nature of ACL injuries, Boskovic was actually able to work out a bit at RFK Stadium in the morning (light running, no bulky bandage).

Will he play again this season?

“It’s possible, but we have to see where he is 2-3-4 months from now,” General Manager Dave Kasper said.

Meantime, United has begun exploring replacement options. Boskovic’s long-term absence allows the club to fill his roster slot but does not offer any salary cap relief.

“It’s like an eighth of your salary cap space,” DCU President Kevin Payne said, referencing Boskovic’s designated player status, which counts for $335,000 of the nearly $2.7 million cap that applies to 20 players. “There have been other teams that have had to play witout a guy at that salary level before and been successful, and there’s no reason we can’t.”

United has some financial flexibility with cap room, allocation money and contracts, Payne said. “There are some things we could do and we’ve been looking into them already, not necessarily new things because of his being out right now, but we do have a little bit of flexibility.”

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Defender Jed Zayner is out again after aggravating a hamstring injury that sidelined him for five weeks. By starting against the Houston Dynamo on Friday, did he return too soon?

“I don’t know if we would have done that if he had been tackled that way with a healthy hamstring,” Coach Ben Olsen said. “Maybe, maybe not. I question after every game whether I made the right decision.”

No specific timetable has been set for Zayner’s return. Rookie Chris Korb is expected to return to the lineup.

Early attendance projections for Wednesday night’s match against the Seattle Sounders at RFK Stadium: between 11,000 and 13,000. There is no standard TV coverage in the Washington area.

If you bump into Olsen, be sure to wish him a happy 34th birthday.