Luis Enrique's side fell to a shock 1-0 home loss at the hands of Malaga last Saturday, allowing Real to move four points clear with their comfortable 2-0 success at Elche a day later.
Once again, Barca are scheduled to play earlier than their title rivals, with Real - and third placed Atletico Madrid - facing Villarreal and Sevilla respectively on Sunday.
"At one stage, a month ago, I was worried for myself," he told Sport890. "I am very self-critical when I don’t help the team and I was missing goals that a player can’t miss.
"I was aware of the team I joined and the money that was paid for me, and the quality of players I have around me.
"I'm fulfilling a role that I know helps the team a lot, occupying defences and letting Leo [Messi] and Neymar get in one-on-ones, where they're unstoppable."
Despite those absences and the disparity in the two clubs' league positions, striker Jhon Cordoba is not giving up hope.
"It's 11 versus 11 and nothing is impossible," said the former Espanyol man. "We'll have our chances of getting something out of the game. We feel conscious that we can win.
"We have to keep working together, all of us united, because there's still important things we need to do, between now and the end of the season."
