"My idea is for Liverpool to take one step forward and I think Robbie can help us make that step," Benitez told the official site.
"We have signed a player with so much passion for this football club and I think he will act as an example to every player here in how much he loves Liverpool.
"It is a boost for the team, a boost for the supporters and a boost for Robbie himself. I'm not sure I've ever seen a player quite so happy to be joining a club before.
"I think it's a signing that will lift everyone who loves Liverpool Football Club because Robbie is a great finisher who can help us reach a new level.
"He hasn't been signed because he loves the club; he's been signed because he's one of the best goalscorers ever to play in the Premiership and he can score goals for us right now. He's got a wealth of experience and he gives us more attacking options. He's a different kind of striker to what we have at the club and that is good for the team.
"People can talk about having a lot of money to buy players but we've just signed a player with a passion and a heart for this club that no amount of money can buy. We are close to a very high level right now but with Robbie we can go even higher."
