Rooney was in the American capital Washington DC this week for talks about joining the Major League Soccer side.
"There is interest in Wayne Rooney from our end and I think there is interest from his end too," DC United head coach Ben Olsen said after his side's 1-1 draw at LAFC in Los Angeles on Saturday night.
"I hope it can get over the line because he's a very good player who can help us. He would be a great player for this league."
But Olsen added: "Nothing is done, so I don't want to get into talk of arrival until he actually arrives.
"Nothing is ever done in this world and when you're looking at a deal of this scope and size. We'll see, but hopefully we can get it done."