Sky Sports reports that the 32-year-old will arrive in Washington at around 7 pm BST on Thursday and will hold a news conference at the MLS club on Monday.
Rooney is expected to sign a three-and-a-half year contract with DC United and start training with his teammates before the week runs out.
He, however, cannot officially become a DC United player until their transfer window opens on July 10.
Rooney seems prepared as he tweeted a picture of himself on a plane giving a thumbs up and a big smile on his face with the flag of America and a plane as his chosen emoji’s.
Rooney’s debut match will most likely take place on the 14th of July against Vancouver Whitecaps at the opening of the new £140m 20,000-seater Audi Field stadium in Washington.
