Mr Van Rompuy has said that there was no impending need for treaty change between the UK and EU, but denied suggestions by Lord Mandelson that that meant he had "shot Mr Cameron's fox".
How do you convince a room full of people, when you keep your hand on the door handle? How to encourage a friend to change, if your eyes are searching for your coat?
Addressing the Policy Network EU conference in London Mr Van Rompuy continued: "Leaving the (EU) club altogether is legally possible" but it would be "a most complicated and impractical affair.
More top news
Millwall fans who caused problems at the match against Barnsley could face lifetime bans, the club said.
Counter-terrorism forces, backed by Shi'ite militias on the ground and coalition airstrikes, are moving into the city on several fronts.
A woman involved in a car crash had to be taken to hospital by helicopter with serious injuries.