Former Real Madrid captain Iker Casillas has taken a swipe at Manchester United manager Jose Mourinho following their defeat to Liverpool on Sunday. Casillas who had a stormy relationship with the Portuguese manager during their time at the Santiago Bernabeu used the opportunity to take a dig at his former boss. Mourinho had sidelined Casillas during his time at Real Madrid and the duo and have confronted their stormy relationship in recent interviews. Manchester United endured a nightmare trip to Anfield on Sunday