"We missed some targets at the beginning and I think we are paying for that ..."
Five arrivals have made their way to Tyneside so far this summer.
But Benitez is unhappy that other Newcastle targets have been missed although he admitted that it has been hard.
'Sometimes it is not about you want, it is about what you need and what you can afford now'.
Tropical storm Franklin arrives with strong winds, rain
Tropical Storm Franklin made landfall early Tuesday on Mexico's Yucatan Peninsula, dumping heavy rain and gusty winds. Tropical Storm Franklin is brewing near the Yucatan Peninsula and threatens to strike Mexico twice this week.
"It is hard for teams who don't have as much money as the big teams".
Arsenal are set to approve a wealth of departures this month and one man on the verge of an exit could be staying closer to home, as a move to a fellow Premier League side is a possibility.
However, the Spanish club are struggling to meet the Gunners' reported £13m asking price and talks are rumbling on.
Owner Mike Ashley had promised Benitez "every last penny" to improve the squad, but fans are unhappy at how little has been done. "I never mention figures but we have done all that Deportivo can, even making a big effort because of the importance that I believe Lucas can have in this team next season".
The 21-year-old arrived at Chelsea from Brazilian club Fluminense in summer 2015 and instead of becoming another member of the loan brigade from the get-go, he was integrated into the first-team instead. "But with his experience and know-how, he will set the team up to be very hard to beat". "It is something you cannot control but at the moment I am fully committed to do the best that I can".