He said: "The boss asked me to play at right-back, and I tried to do my best. I don't know if it was good or not but I just tried to do my best.
"I have played as a right-winger in Argentina, but I am a central midfielder and that is where I am best. I knew the new role was just for one game, and I am prepared to do that for the team.
"I always try to think about the team. For this game and with the injuries we knew we had nobody else."
He added: "We knew we had to win after what happened on Saturday. We are not too close to Manchester United, but we have to keep fighting to see what happens next.
"The supporters were nervous. We have not been taking our chances. But if they see the team playing well they will understand and help us."