Benitez and team mate Giovanny Espinoza had been due to fly to Ecuador next Sunday to prepare for the two World Cup quaifiers against Uruguay on October 10th and Chile on 14th October.
However the Blues striker has been granted permission to return to Ecuador a week earlier than expected to 'address situations of a personal nature'.
Benitez is unlikely to return to England this week and will therefore miss Blues' weekend Premier League match against Burnley at Turf Moor.