West Ham's owners have shown a very unmodern degree of patience with Sam Allardyce. It's hard to think of many other clubs except perhaps Manchester United that have given the manager such a lot of time to turn around such an under-performing side.
There are however good reasons for sticking with Sam Allardyce. Firstly, it would cost a lot of compensation to sack Allardyce and his large backroom staff. This money is better spent on the pitch. Secondly, West Ham have been beset by injury after injury. Thirdly, if you wanted a manager to scrap and fight a team to safety you would look towards Sam Allardyce.
Big Sam should be able to keep West Ham. The caveat to this is that they get another centre half fit. Roger Johnson will relegate West Ham if he is given enough time on the pitch to do it.
Verdict : Safe