"I haven't heard anything," Reyna told the Lancashire Evening Telegraph.
"I don't want to comment on speculation, or something I've read in the newspapers, which is all I know about those clubs' interest.
"I've just come back from a lengthy layoff, so right now my main focus is on helping the US in the Gold Cup and then go back with Sunderland.
"If anything else develops I'll have to see what happens."