The present invention relates to a needle cover assembly to be used with a medicament delivery device, wherein said needle cover assembly (10) is disposable and comprises a retainer element (50) connectable to the medicament container holder； a hub (16) having a longitudinal axis and comprising a double pointed injection needle (22) with a proximal needle end (24) and a distal needle end (48), wherein the proximal needle end projects a distance from the hub (16) along the longitudinal axis, and a shield (18) covering at least the proximal needle end and a portion of the hub (16). The invention is characterised in that said shield (18) comprises a detachable element (26), that the shield (18) is attached to the hub (16) when said detachable element (26) is attacked to the shield (18), corresponding to an untampered state, and that the shield is released and is telescopically movable in relation to the hub (16) along the longitudinal axis when said detachable element (26) is detached from the shield (18) corresponding to an activated state.
