His lack of mobility is my big issue with him.
Carricks lack of mobility/pace could be easily dealt with if SAF played a three man midfield with two mobile CMs to help Carrick.
It's like Viva said. Carrick has a very hard job to do as SAF likes playing him with our two oldest CMs who offer absolutely nothing defensively. His deficiencies are always going to be highlighted when he has the majority of the donkey work to do.