Gerrard said: "He's a very enthusiastic footballer and very intelligent.
"He's like a kid in the street and he can't wait to get out for training and games. Alongside Dirk Kuyt of late, they've been like two Duracell bunnies.
"They just don't stop and for defenders that must be a nightmare, knowing when you control the ball those two will be chasing.
"It's fantastic to have him and hopefully he can continue his form until the end of the season.
"If he does, it will give us a much better chance of getting some silverware."