It is not the money they have spent in recruiting him that makes it difficult for him to be sacked, but the terms of agreement and the amount they will spend if they terminate his contract. The coach is not a bad coach to me, in the few games he has had against big managers, he has performed well. I think that he should be given more time to try build the team. Coaches like Arteta from what I heard started really bad with the team, but he had the time to build the team to the extent it is currently.