I haven't seen the incident but it worries me that a manager makes assumptions and claims that aren't necessarily correct. Gary Monk seems to imply Green should have been send off because he handled outside his area and that ain't true.
Firstly, a player must deliberately handle the ball (in the case of a keeper, outside his penalty area). As I read the laws, if a player does this to prevent an opponent gaining possession, it's a caution. A sending off can only be for preventing a goal or an obvious goal scoring opportunity. LOTG states "This punishment arises not from the act of the player deliberately handling the ball but from the unacceptable and unfair intervention that prevented a goal being scored."