The former Ajax midfielder said: "There are a lot of clubs who cannot afford to make a mistake and we are one of them.
"That is the reality at the moment. On the other hand if you win one or two games you can climb the table quite quickly.
"Home games are really important and we should be aiming for three points there."
Everton had to settle for a draw against Middlesbrough at the weekend and De Ridder added: "They are a good club with good players. It should be an interesting game but I think we will definitely have chances."