Chelsea manager Jose Mourinho says his side will be looking to sign a striker this summer.
His comments follow Chelsea's 1-0 defeat to Crystal Palace last weekend - a development which left the club two points behind leaders Liverpool after their Sunday win over Tottenham.
Mourinho announced after the defeat that Chelsea's Premier League title chances were over.
"Now it's impossible to win the title," he said. "We depend too much on other results."
He added: "When you depend a little it's possible, when you depend a lot I don't think it is possible.
"Mathematically it is still possible but one thing is mathematics and another is reality."
Chelsea strikers - Samuel Eto'o, Fernando Torres and Demba Ba - have scored a combined total of just 15 league goals this season, and Mourinho believes that some members in his current squad need to improve in order to win the title.
"I think it is clear in everybody that Chelsea next year wants to bring a striker," Goal.com quoted him as saying.
"That is clear but it is also clear that we want to improve our players.
"I can't, and I don't, need to improve [Gary] Cahill, [Branislav] Ivanovic, John Terry. I can't improve them and I don't need to improve them.
"But there are other guys I need to improve. I think we are doing that step by step but it is not enough to be champions."
The Portuguese tactician added that some current Chelsea players will make way for new ones in the summer.
Mourinho said: "And it is also sometimes normal that, at the end of the season, players – I am not speaking about the strikers but players that are not playing a lot or are not happy and prefer a change - that is part of the market.
"We want to improve the team and the players and make some surgical movements in the transfer window."
