Sunderland AFC statement: "Sunderland AFC would like to advise its supporters that standard tickets in the Sunderland end of Wembley for the Capital One Cup final can only be purchased through the club’s official channels or by being a member of Club Wembley.
"The club has been made aware of fraudulent attempts to sell tickets for the game, which are now being investigated by the Police, The Football League and SAFC.
"Supporters are reminded that each ticket is registered and traceable to the individual who purchased it. Under the terms and conditions of issue, anyone found attempting to sell, or who has sold tickets for the game, will have the tickets cancelled and will also jeopardise their SAFC season card."