Source or it's not happening.
Sorry, but this is illogical. Why would he agree to sign an extension and be traded, effectively removing the option for him to run up his price and chose his team? He can't be traded until March 14, the first day of the new league year, which is the day he would become a FA anyway. To keep him, the Redskins would have to PAY the man or tag him - the transition tag next year would be $28,732,320 and the franchise tag $34,478,784 (per Schefter).