The Toffees fell into the relegation zone on Wednesday after an embarrassing 5-2 defeat to Liverpool in the Merseyside derby.
"I am not the right person to answer about the situation, this question is for different people," said Silva.
"We are making some mistakes which put us under big, big pressure.
"The type of mistakes we are making is because the players are playing under big pressure because of the position in the table. They are making some mistakes that are not normal for the level we are."