The Reds boss came under fire from sections of the Anfield faithful on Saturday when he refused to give the £20million summer signing from Tottenham a chance to score a winner as Hull held them to a 2-2 draw.
And when quizzed about the prospect of the club's owners George Gillett and Tom Hicks not being impressed by a big-money signing being left on the bench, Benitez claimed he is not worried and expects them to fund more signings in the future.
He told the Daily Post: "I don't think about this, only about the team. I think that next year they will be really worried about different players worth £20m on the bench every single week."
On his decision to use Ryan Babel, Nabil El Zhar and Lucas Leiva ahead of Keane, Benitez added: "We wanted to keep (Xabi) Alonso in the middle trying to control midfield, because Javier (Mascherano) was going too hard and Lucas is a player that can get into the box really well. He has the quality to deliver a final pass.
"I wanted more quality in the middle. Mascherano is a defensive midfielder, Lucas is more offensive. He can pass the ball and he is more precise.
"You have to think about winning. For me, the best thing was to use wingers and an offensive midfielder that can pass the ball better, because in the last minutes of the game you need someone calm who can pass the ball better.
"To put more people into the box and start playing long balls is not the solution."