Manchester United are seven points clear but Spanish star Silva insists his side are still in with a shout.
He said: "If we win at Stamford Bridge and United have a few more problems in the closing weeks, there is still a chance of us winning the league.
"Chelsea are also obliged to win, so the situation increases the pressure. I think the team with the better attack will win.
"We need to hold our nerve and not change our attacking philosophy."