Audi Field was built primarily to house D.C. United, but the 20,000-seat soccer stadium was also designed to stage other events. And in what is its first major score outside of MLS, the venue has reached an agreement in principle to host a U.S. men’s national team friendly in June, multiple people familiar with the selection process said Tuesday. The opponent has not been secured yet by the U.S. Soccer Federation, which has scheduled games for June 4 or 5 and the 9th in the buildup to the Concacaf Gold Cup that begins June 15. The U.S. team’s opener is June 18 at the new MLS stadium in St. Paul, Minn. Cincinnati, which will have an expansion team in MLS this season, is the favorite to host the other U.S. friendly, said those sources, who requested anonymity because they were not authorized to speak publicly. Per policy, the USSF declined to comment on the venue search while negotiations continue, but a spokesman said the governing body is aiming to announce the choices in a few weeks. The U.S. men’s team last appeared in Washington in October 2016, a 1-1 draw with New Zealand at RFK Stadium. No venue in the country has hosted the men’s squad more than RFK, but with Audi Field’s opening last summer, the new venue has sought to attract international matches. RFK remains in the mix: On March 26, it will host a friendly between Peru and El Salvador. And FedEx Field in Landover will continue to appeal to large-scale matches, such as the annual International Champions Cup, featuring elite clubs from around the world.