Ivanovic has helped Chelsea quite a bit going forward, he sometimes lacks the defensive positioning. However, I feel that because of his determination, there has to always be a place for him and the only way I see Luis getting a chance at the moment is if there is an injury to any of the back 4. If JT or Cahill get injured then Ivanovic should play cover at CB, whilst Azpi moves back into his favoured RB position and Luis down the Left. The only thing is that he might want to give Zouma a chance.