The one question Chelsea must answer to win the Premier League title

Diego Costa attempting an overhead volley

With just a week to go until the start of the Premier League season, Chelsea will be hoping to mount a title challenge.

The Blues ended Jose Mourinho's first season back at Stamford Bridge without a trophy, having lost their grip on Premier League top spot and come up short against Atletico Madrid in the Champions League semi-final. Yet, despite the lack of silverware last season, Chelsea fans have a certain sense of optimism ahead of the new campaign.

Mourinho has spent around £80m acquiring new talent, with Atletico Madrid duo Filipe Luis and Diego Costa joining former Barcelona midfielder Cesc Fabregas and ex-Blues hero Didier Drogba in West London, whilst we've also seen a number of big names leave Stamford Bridge in the former of David Luiz, Ashley Cole, Frank Lampard and Samuel Eto'o.

The Blues are now expected to be firing on all cylinders with their new signings, but what question do Chelsea have to answer in order to win the Premier League title?

Where are the goals coming from?

It's no secret that Chelsea struggled for goals last season, at least in comparison to their title rivals. Champions Manchester City and second placed Liverpool hit 102 and 101 goals respectively, whilst Chelsea were left lagging behind on 71 goals scored. In order to try and beat them to the title, Chelsea must hit the back of the net more regularly.

New signing Costa hit 35 goals for Atletico Madrid last season and will be relied upon heavily when leading the line on his own, but concerns have been raised over his record before last season - 67 goals in 226 games - and because of his below-par displays at this summer's World Cup.

Factor in that Fernando Torres continues to struggle and a 36-year-old Drogba will be nowhere near the player he was during his first spell at Chelsea, and you begin to see why there are still question marks being raised over the Chelsea attack despite the heavy spending.

Ultimately, much of the mantle could fall onto the shoulders of Fabregas. The former Arsenal skipper has been signed as a replacement for Lampard in the Chelsea midfield, and with that comes an expectation for scoring goals. Having hit double figures in goals in five of the last seven seasons, and racked up double figures in each of the last season eight years, it's clear that Fabregas will be expected to create and score - particularly if Chelsea's strikers aren't in top form.

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