The setback, against a previously one-win Montreal side, stunted an upbeat stretch of results and soured the start of a three-game homestand. The Philadelphia Union, which won its first match last weekend, will visit RFK Stadium on Saturday.

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Further reflecting on the Montreal outcome, Olsen said: “We actually started out pretty well until the goal and then it deflated us. And that’s not how we need to respond after going down. For about 25 minutes, we were feeling a little bit sorry for ourselves. Again, it’s not an acceptable response.”

United (3-4-2) has conceded a goal in the first 15 minutes of the past three matches. The first two times, D.C. responded in a way to claim one point at New England and three in Atlanta. The third time was the end of the charm.

The buildup to the Philadelphia match is, Olsen said, “a good chance for the group and myself to make sure we understand that we have to all be at a certain level to succeed. If four or five players turn it down just a bit, that’s enough. I’m not overly concerned. I believe this group has a response in it.”

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>> Defender Steve Birnbaum has resumed normal workouts after missing two matches with a concussion and, according to the medical staff, has been cleared to play this weekend.

>> Goalkeeper Bill Hamid, a last-minute scratch against Montreal with a groin ailment, did not train Tuesday but should return Wednesday, Olsen said. Travis Worra started against the Impact.

>> Elsewhere on the injury front: Midfielder-defender Nick DeLeon (hernia) is likely to have surgery, which would sideline him for an additional month; midfielder Patrick Nyarko (hamstring) has begun running; midfielder Rob Vincent (blood clot) remains out; defender Sean Franklin skipped training because of hamstring tightness; and midfielder Julian Buescher is sidelined with knee tendinitis.

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>> Released by United on Monday, Canadian left back Maxim Tissot has an opportunity to sign with the San Francisco Deltas in the second-flight North American Soccer League, Olsen said.

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The reason for Tissot’s departure was twofold, Olsen said: Veteran Chris Korb, who can play on the left or right, re-signed last week and Tissot probably wasn’t going to receive much, if any, playing time in Washington anyway. His only appearance came at New England on April 18 while Taylor Kemp was recovering from illness. He had gone on assignment to the USL’s Richmond Kickers, as well.

>> With Patrick Mullins fully back in the mix — he entered at the start of the second half Saturday — Olsen will have to decide who to start in the lone-striker role this weekend: Mullins or Sebastien Le Toux (or, for that matter, Jose Guillermo Ortiz or Lamar Neagle).

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“We’re going to look at a few different things this week,” Olsen said, hinting at the possibility of Le Toux playing wide. “It’s a fine balance of mixing things up, but also letting guys grow together and keeping that continuity. … Both are going to play into this and help us.”

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>> Chris Durkin reported to training Tuesday, less than two days after starting for the U.S. under-17 national team at the CONCACAF championship in Panama. He awoke at 6 a.m. Monday and arrived home at 9 p.m.

The Richmond native was named to CONCACAF’s Best XI. The Americans, who lost to Mexico in the final on penalty kicks, qualified for the U-17 World Cup in October in India.

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Durkin’s primary role was in defensive midfield; he started at center back in one match. He said he believes his future is in that deep-lying midfield position. With Marcelo Sarvas, 35, on the back end of his career, Durkin, 17, could seize the job in the coming years and form a young central midfield with Luciano Acosta and Ian Harkes — both 22 years old — as United moves into the new stadium, Audi Field, at Buzzard Point.

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“I think my attributes cater more to being a No. 6,” he said of defensive midfield. “It’s good to be flexible, but I like where I am.”

Back from international duty, Durkin is slated to resume match assignments with the Kickers. However, Olsen said: “We’re also banged up. We’re okay to put him in a game. We feel good about it and excited about it.”

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>> United academy graduate Eryk Williamson, an Alexandria native and sophomore attacker at the University of Maryland, was named to the 21-man U.S. under-20 squad for the World Cup in South Korea, starting this month. He is very much on United’s radar for a possible homegrown contract sometime this year.

>> Le Toux, a native of France, said he was happy with the results of Sunday’s presidential election. He did not vote but kept tabs on the campaign. Emmanuel Macron won in a landslide.

“In the first round, I knew the extreme party was going to do well because of the terrorist attacks in France,” he said. “As soon as it got to the second round, I wasn’t really worried. I knew France would elect the better person. I knew it would be okay.”