The Bluebirds are very much in the relegation scrap and sit second-bottom in the Premier League table, a point clear of Fulham and level with Sunderland above them, although the Black Cats have three games in hand.
Cala, however, is upbeat about their chances of avoiding the drop but warned winning their remaining home games will be crucial as they prepare to host title-chasing Liverpool this weekend.
He told the club's website: "We did well at Everton, despite losing the game. We knew that Everton were going to push us hard and that our defence had to be very attentive.
"What we have to do now is work hard to beat Liverpool. I think in this last fortnight we have seen another Cardiff City, working much harder, a better team.
"Playing at home will help us and I think if we can win our home games we will stay in the division. In front of our home fans I think everything is possible."
Following the clash against the in-form Reds, Cardiff go to West Brom before home games with Crystal Palace and Stoke in April alongside trips to Southampton and Sunderland. Then in May they go to Newcastle before a tough final-day home clash with Chelsea.