BALTIMORE — As MLS decision-makers began descending on Charm City for the MLS draft Thursday — one in which a Georgetown Hoya might go first overall — D.C. United officials were keeping tabs on their star goalkeeper in a Los Angeles surgery center.

Bill Hamid underwent a knee operation Wednesday to repair meniscus issues that he said on his Instagram account have “plagued me the past year.”

United expects to receive more information Thursday. No other details were immediately available.

Hamid had a knee procedure last summer, as well. It’s believed to be the same knee.

Unless more serious problems were discovered, Hamid would probably miss about a month. United will play its first serious match Feb. 23 in the CONCACAF Champions League quarterfinals.

The 2014 MLS goalkeeper of the year and 2015 finalist was slated to work out with the U.S. national team in Carson, Calif., before reporting to United training camp early next month. However, he arrived at U.S. camp last weekend with the ailment and was examined by the U.S. medical staff. On Tuesday, the U.S. Soccer Federation announced Chicago’s Sean Johnson would replace Hamid on the roster.

A day later, national team surgeons performed the operation.

“Now the road to recovery begins,” Hamid wrote on Instagram.

With English-based keepers Tim Howard and Brad Guzan unavailable for this U.S. camp, Hamid would have started one or both of the friendlies at StubHub Center, Jan. 31 vs. Iceland and Feb. 5 vs. Canada.

For United, the U.S. camp and matches were secondary to Hamid’s preparations for the 2016 campaign, which will begin against Queretaro (Mexico) in the first leg of the Champions League quarters. Last year, Hamid was sidelined with other ailments and missed the first stage of the quarterfinals against Alajuelense (Costa Rica), a 5-2 away defeat.

Backup Andrew Dykstra, who signed a new contract this week, started nine regular season matches and 16 overall last year. Second-year Travis Worra is also under contract.

United will begin the 34-game regular season March 6 against the Los Angeles Galaxy.

Hamid’s injury caused a distraction for United ahead of the draft at Baltimore Convention Center. The club is likely to remain in the No. 13 slot of the first round. United’s brass spent the past week at the scouting combine in Fort Lauderdale, Fla.

With college players out of season and thrown together for the first time, definitive assessments do not come easy for MLS coaches and general managers.

“The combine is the combine,” Coach Ben Olsen said. “Every year, I get more confused. There are a few guys who are slam dunks, but this draft will be unpredictable.”

Defender Josh Yaro, who left Georgetown with one year of NCAA eligibility left, is considered a slam dunk. Many draft experts and scouts consider him the top prospect in the field and the most likely No. 1 pick by the Chicago Fire. However, Stanford defender Brandon Vincent, a U.S. national team call-up this week, and Wake Forest midfielder Jack Harrison are also in the mix. Chicago has fielded at least two trade offers.

Olsen said United is seeking to bolster depth at almost any position. Virginia’s Todd Wharton might fit into a roster desperate for reinforcement in central midfield in the wake of Perry Kitchen’s exploration of European opportunities and Davy Arnaud’s concussion recovery.

“Do you go through the whole thing with the best available player? Or do you address a specific need?” Olsen said. “There are all kinds of scenarios, but we’ll see how it plays out with the picks before us. It’s wide open for us.”

For an immediate impact, though, United is pursuing help in the South American and European marketplaces. Olsen said he is hopeful of at least one deal in the near future.

United notes: The club received a fourth-round pick from the New York Red Bulls, completing an unannounced trade last winter that had transferred the discovery rights for defender Kemar Lawrence. Previously, the Jamaican was on trial with United, but because of an injury, did not show well and was subsequently cut. He went on to have a standout season with the Red Bulls.

United does not have picks in the second and third rounds, but three in the fourth. MLS will conduct the third and fourth rounds via conference call next week.

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MLS Draft

Where: Baltimore Convention Center.

When: Thursday, 1 p.m. ET.

Format: Two rounds (41 picks). MLS will conduct third and fourth rounds via conference call next week.

Live streams: WatchESPN, Fox Sports Go, mlssoccer.com

First-round order

1. Chicago. 2. Colorado. 3. Philadelphia. 4. New York City FC. 5. Real Salt Lake. 6. Philadelphia (via Houston). 7. Orlando. 8. San Jose. 9. Toronto. 10. New England. 11. Kansas City. 12. Los Angeles. 13. D.C. United. 14. Montreal. 15. Seattle. 16. Vancouver. 17. Dallas. 18. New York Red Bulls. 19. Columbus. 20. Portland.

Top 5 prospects

Georgetown D Josh Yaro

Stanford D Brandon Vincent

Wake Forest MF Jack Harrison

Creighton F Fabian Herbers

Akron MF Richie Laryea

Other local college prospects

Georgetown D Keegan Rosenberry

Georgetown D Cole Seiler

Maryland MF Tsubasa Endoh

Virginia MF Todd Wharton

Georgetown D Josh Turnley

George Mason D Taylor Washington

Maryland D Ivan Magalhaes

Virginia Commonwealth D Dennis Castillo

Other locals

UNC Wilmington F Colin Bonner (Reservoir HS, Columbia, Md., DCU U-23s)

Wake Forest F Michael Gamble (McDonogh School, Columbia, Md., Baltimore Bays)