Gerrard admits he loved playing with the Spanish striker.
He told liverpoolfc.com: "He's had some big injuries. I know myself that it is difficult to come back from injuries like that. I think he has shown signs this year that he has got the form back but I think everyone talking about him and his price tag puts a lot of pressure on his shoulders every single week.
"I'm not sure he gets the love at Chelsea that he had at Liverpool. He was the top man at our place; we used to love having him about. I was heartbroken when he left. I think now, if he is honest, he probably regrets leaving because he was flying at Liverpool and he was probably one of the best players in the world when he was on form.
"The whole team and the whole set-up was in place for him to play well and for him to win matches for us. And I'm not sure he gets that treatment at Chelsea. I think he is one of a number of quality players. He thrives on confidence and at Liverpool, every single week, he was flying."