Barcelona signing Javier Mascherano is struggling to adjust to coach Pep Guardiola's system.
El Mundo Deportivo says there's already calls for Guardiola to go with Sergio Busquets ahead of the Liverpool midfielder.
Busquets passing and ease with which he releases the ball is in contrast to Mascherano's laboured approach so far.
Barca management have no doubts about the Argentine's ability, but accept it will take time for him to adjust to their style of play.
