From now until end of the season should be treated almost as a trial period for him. Prove you know how you want the team to play and give us a run of results that will give us confidence on promotion next year. If we continue this way and finish 15th-20th then he'll be on thin ice surely?
His record in this league is class but you don't need championship experience to do well e.g. Carvalhal at Sheffield Wednesday , Jokanovic at Watford, Karanka at Boro.