"If a deal is to be done it should be completed by the end of the week or not at all," Williams told BBC Radio Lancashire
Blues, who are believed to be the only club to have made a firm bid for the former England Under-21 skipper, are believed to have raised their initial £3.5million down payment by £500,000 to £4million with the rest of the £5.5million fee being paid on appearances and success.
