After missing a league match for the first time this season, D.C. United’s Dwayne De Rosario said his sore shoulder has improved and he expects to play Sunday against the Philadelphia Union at RFK Stadium.

“I should be good, back at it — definitely,” he said after Wednesday’s training session.

De Rosario, tied for second on the MLS assists chart with 10, was injured in a hard fall against Columbus on Aug. 4. Although he remained in that match, “I couldn’t take any physical challenges, so we decided it was the best time to take a rest.”

Without him, United labored to maintain possession and sustain an attack in a 2-1 loss at Sporting Kansas City over the weekend.

The break might prove beneficial in the long run.

“It was my first game off this year, and if you take in World Cup qualifiers and all-stars, I really haven’t had a rest,” he said. “I never want to rest this way, but it was an opportunity for me to rest and get my legs back under me and heal my shoulder.”

The injury forced him to withdraw from Canadian national team duty ahead of tonight’s friendly against Trinidad and Tobago in Florida. Teammate and compatriot Dejan Jakovic did report to Canada camp.

The only other United player on international duty is Albanian forward Hamdi Salihi, who is home for a friendly against Moldova.

*Midfielder Branko Boskovic, who left Saturday’s match at halftime with a sore knee, practiced Wednesday.

“I was scared. I felt something and I thought it might be meniscus,” he said. “But they told me that is normal when you’ve had surgery. They checked it out and everything is okay.”

*Left back Daniel Woolard, who suffered a concussion in the Columbus game, remains sidelined. Forward Maicon Santos (sore toe) didn’t practice today after missing the Kansas City trip.

*Club officials are hopeful that Raphael Augusto, a Brazilian central midfielder acquired on loan from Fluminense, will finalize visa paperwork soon and report by next week.

*In a reserve division match Monday, United defeated the New York Red Bulls, 3-1, on goals by Josh Wolff, Danny Cruz and youth academy player Suliman Dainkeh, a rising senior at South Lakes High School in Reston and University of Maryland recruit. United’s next two reserve matches are with Montreal: Sept. 7 away and Sept. 11 at home.

*Reminder: Two international friendlies will take place at RFK tonight as Guatemala faces Paraguay at 6 p.m., followed by El Salvador and Jamaica around 8 o’clock. You can read my preview by clicking here.