"I wasn't nervous about asking Carra to play in the position, he knows my idea and also he knows that he needs to work for the team," Benitez told liverpoolfc.tv.
"In some games he needs to do this job and I think it is OK. We know that he prefers to play as a centre-back. But he knows that it is important now for the team his position as right full-back.
"He is the vice-captain so he knows he must be an example for the rest of the players. I was talking with him and he knows my idea about the future, so it is not a problem.
"His future is not as a right back. Finnan was injured and we were using Arbeloa, so I don't have any problem in this position. The only thing is the qualities and conditions of Carra are different to Arbeloa or Finnan.
"I was trying to use Carra because defensively he is more aggressive. That was the idea."