Newcastle United supporters will certainly not be enthralled by the prospect of Sam Allardyce arriving back at St James' Park on Sunday afternoon looking to lead his West Ham United side to victory - and possibly condemn the Magpies to relegation from the Premier League. Should John Carver orchestrate Newcastle's first victory since February 28th - they have lost nine out of their last 10 - they would guarantee their top-flight future for another season. Lose or draw, however, and Hull City could capitalise by beating Manchester United at the KC Stadium - and condemn the Magpies to Championship football in 2015-16. So just how can Carver alter Newcastle's recent woeful form and do the unthinkable by securing all three points on Sunday? And just who will Big Sam look to in order to ensure that he ends his Hammers reign - if rumours of his imminent dismissal are to be believed - with a victory? After all, the players are the ones that really matter once kick-off arrives at 3pm on Sunday. So here are three key head-to-heads that could go a long way to deciding whether or not Newcastle United can get the win they need over West Ham United in order to secure their Premier League survival...