Xabi Alonso's future at Liverpool is in doubt.
The People says Alonso, 26, is being kept out of Liverpool's first-choice side by Brazilian youngster Lucas Leiva, a £9.5m summer signing from Gremio.
But Benitez said: "Alonso is fit but Mascherano is playing well and so is Lucas. We have been playing with Lucas, Gerrard and Mascherano together and I don't really need another central midfield player on the bench.
"But Xabi is training well and if he plays well his future is here, why not?
"If you want to win trophies, you have to keep the good players with you."