West Ham take on their London rivals Chelsea at the London Stadium this evening (8pm).
The Blues are in a rich vein of form, losing just once in their last 10 Premier League outings.
However, Hammers defender Winston Reid has claimed he is not intimidated by the Stamford Bridge club or their highest scorer Diego Costa.
And the New Zealand international has revealed he will be watching the striker closely all game to nullify his goalscoring threat.
"When you play against top players you have to do your best," Reid told the London Evening Standard.
"Try and be at the best of your game or you get found out.
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"You have to try and keep your eyes on him [Costa] at all times and make sure you're close to him and mark him in the box where he's dangerous."
Costa has been Chelsea's danger man in front of goal this season, scoring 17 times in all competitions.
His last goal came in the 3-1 win over Swansea.