Manchester United defender, Aaron Wan-Bissaka, is demanding a pay-off from the club before he completes a move to West Ham. Both Premier League clubs have all but agreed a £18million fee for the 26-year-old. Wan-Bissaka’s current contract at Old Trafford expires next summer and United want to cash in this summer, rather than lose him for free. However, the deal is in a limbo, as West Ham can’t afford Wan-Bissaka’s £90,000-per-week wages, according to The Sun. The right-back would be able to command a huge signing-on fee next summer and is demanding a multi-million pound pay-off to leave this s…