Many critics have pointed to the Spaniard's infamous rotation policy for having caused a number of disjointed performances, while an international break immediately after that Derby victory certainly cost them momentum.
And while it has been noted Liverpool's difficult period appears to have coincided with the departure of fitness coach and assistant manager Pako Ayesteran, Benitez stressed the only person responsible was himself.
"The problem is a tactical problem and it is my problem," said Benitez, who after this recent international break now has to get his side ready for a Merseyside derby at Goodison Park on Saturday.
"Confidence (of the squad) is also an issue but not the physical condition of the players. We are running more and faster than before."