David Moyes wants his players to stop looking over their shoulders and pull away from relegation trouble.
West Ham are 16th, one point above the relegation zone, after their dramatic 2-1 win over West Brom on Tuesday.
They travel to Tottenham just 48 hours later - live on Sky Sports Premier League from 19:30pm - and Moyes wants his players to set their sights on moving up the league.
Moyes said: "The aim now is to try and not be talking about it (relegation), and to look up. The players know we have missed one or two opportunities to be further away.
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"You can see how the Premier League is going to go between now and the end of the season, games are going to be won and lost on really fine margins.
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"There is a lot of tension at the bottom because two defeats and you slide back in, two wins and you can be talking about mid-table."
Tottenham also played on Tuesday night, winning 2-0 against Swansea, and they did so with Harry Kane starting as a substitute.
However, Mauricio Pochettino expects Kane to be fit to face West Ham - which is likely to bring him face to face with West Ham defender Angelo Ogbonna.
When asked about facing Kane, the Italian said: "I have a lot of respect for Harry Kane, he's a fantastic player.
"But Harry Kane is Harry Kane because Tottenham have a lot of top players around him.
"I'm worried about Christian Eriksen, Dele Alli, Son Heung-min. I don't fear them, but I respect them."