But Ranieri seems certain that Crespo is the final piece of the puzzle for his Chelsea dream team. He said "I have told Hernan that his characteristics are very good for English football.
"He is another lion and is a fantastic player, another good champion for us. He is very fast, good in the air and scores a lot of goals. It is a very important signing for us.
"He only played a few matches in Serie A last season but was the second leading scorer in the Champions League with nine goals in 12 games.
"You can play well but if you don't put the ball in the back of the net, then it is no good - and it is my neck on the line.
"Of course, he and Juan Sebastian Veron have known each other for many years and played together in the Argentina Under-21s before the senior side.
"I hope that they can bring the best out of each other. It is important that they know each other well and Seba can help introduce Hernan Crespo to English football."