Former Chelsea defender William Gallas feels they need to buy a new striker.
Gallas says the squad doesn't have enough firepower.
He told Gamblingzone: "Chelsea need a striker, one striker and maybe one experienced midfielder. They need a striker although it looks like Jackson is really good, he is still young and has to learn.
"I don't know if he is going to score enough goals for Chelsea to help them win the Premier League one day.
"To win the Premier League, your striker needs to reach around 20-25 goals and I don't think Jackson will do it, even though I think he is a really good young player who you can see his qualities."