Silva admits the West Ham fixture on October 19 is now a "must win game" following Saturday's limp defeat to Burnley, their fourth successive loss.
They have picked up just seven points from eight games.
Silva said: "When I say to you it is a must-win game, it is a must-win game, we should win that game, we must win that game to get the three points and get a better position on the table and grow our confidence.
"It's important for the fans to keep the faith. Of course they want more and they deserve more. Our players are sticking together."