The Hammers travel north to take on Newcastle United on the final day of the season and a win could condemn his former club to the Championship.
The Magpies sit 17th on the table, two points above Hull City, meaning a defeat at the hands of West Ham and a Tigers win over Manchester United will see them relegated but Allardyce says he cannot worry about other people in today's cut-throat world.
"It's been talked about in the dressing room with me, Kevin (Nolan) and Andy (Carroll)," said Allardyce regarding his two former Newcastle players.
"From our point of view it's about being professional, not about what we do because it's Newcastle and we were there.
"It's about trying to win there for the benefit of ourselves and the justification for everybody else in terms of who are fighting that relegation battle. We have to try and do our very best.
"You can't show any sympathy for anybody, because nobody shows any sympathy for you."