Terry begins his four-match ban for racially abusing Anton Ferdinand at Tottenham today and will also miss home games against Manchester United, in the League and Capital One Cup later this month, as well as the top-flight match at Swansea.
Cahill told Chelsea TV: "We have some massive games coming up and it's going to be important.
"It starts tomorrow with the early kick off and it's going to be a huge game. Both teams are in form at the moment, so it's going to be tough.
"I feel okay. It was good to get back out training again because I have done a lot of travelling and haven't done much for the past couple of days. It was important that I got back out and got moving - I enjoy being back out on the pitch."