Benitez told The People: "We had contact with different people and were analysing the situation.
"But if you want to play Torres and Gerrard there is not always a lot of space for other players.
"When I brought back Robbie Fowler it was a different situation. We were looking for someone who could understand his role clearly and he was a good finisher.
The Spaniard is also confident he already has enough squad depth at his disposal to cope with any injuries.
"We are confident in (Dirk) Kuyt, (Ryan) Babel, (David) Ngog and (Andriy) Voronin for next season. We have players with quality," he added.
"People say I might need another striker but I remember signing Robbie Keane and everyone was saying good things.
"Then after I sold Robbie people were saying I was short of strikers but we scored more goals than anyone in the Premier League."