Both teams were already slated to play in North America and were seeking a final match before heading home.
Kickoff is set for 8 p.m. ET. A ticket presale for D.C. United plan holders, Baltimore Blast season ticket holders and local Chelsea and Roma supporters clubs will begin Thursday. The general sale starts Saturday, with prices beginning at $38. Ticketmaster, United and the Blast will handle sales.
Chelsea, the 2012 UEFA Champions League winner and 2013 Europa League champion, is coached by the renowned and controversial Jose Mourinho, who has begun his second tour with the London club after leaving Real Madrid this summer.
The star-studded roster includes Frank Lampard (England), John Terry (England), Ashley Cole (England), Eden Hazard (Belgium), Fernando Torres (Spain), Juan Mata (Spain) and Petr Cech (Czech Republic). Chelsea has reportedly made a summer offer for Manchester United’s Wayne Rooney, as well.
The Blues, who finished third in the Premier League last season, visited Washington in 2005 for a 2-1 victory over D.C. United at FedEx Field.
Roma, which finished sixth in Italy’s Serie A, features U.S. national team midfielder Michael Bradley and Italian legend Francesco Totti. Before coming to Washington, Roma will face the MLS all-stars in Kansas City, Kan., and Toronto FC in Ontario.
Chelsea is competing in the International Champions Cup, an exhibition tournament at several U.S. venues.
Chelsea opens the EPL season Aug. 18 against Hull City.