Although third-placed Chelsea look comfortable in the Premier League for now, they could find themselves in a spot of bother during the second half of the season unless they play their cards right in the January transfer window.

Here are three jobs Jose Mourinho must complete in order to steer the Blues clear of mid-season crisis.

Replace John Terry

As his ageing legs begin to overshadow his courage and leadership, John Terry is becoming more of a liability than an asset in Chelsea's back line.

The 32-year-old skipper is certainly a key figure in congealing Jose Mourinho's under-construction squad, but as the new cohort of Chelsea stars make the first-team grade, his minutes will gradually evaporate next season and beyond.

However, replacements do not appear to lie in-house. Gary Cahill and David Luiz have failed to confirm their long-term status at the club and although Branislav Ivanovic looks the part in the centre of Chelsea's defence; the 29-year-old won't be around for much longer than his captain.

All signs point to one blunt albeit elusive answer: sign a young centre back with the potential to fill the boots of JT.

Keep hold of Juan Mata

Chelsea would look a different side without John Terry on the team sheet, and the same could be said of Juan Mata. Despite experiencing initial turbulence under Jose Mourinho, the pair seem to have put their differences aside – but that won't stop clubs chasing his signature come the January transfer window.

The two-time Chelsea Player of the Year has provided the foundations for much of his club's success since his arrival in August 2011 – collecting a total of 49 assists and 32 goals to date.

A poor defensive work-rate hardly justifies the exclusion of a supremely talented playmaker from first-team football – and Jose will certainly hear about it from the Chelsea faithful if he decides to show Mata the door in January.

Sign a striker

Losing the 25-year-old midfielder would be a complete disaster for the club, but the Blues' real problems stem from the absence of a genuine goalscorer.

Not one Chelsea striker has registered a single goal in the Premier League so far this term – a diabolical statistic that could see Samuel Eto'o, Demba Ba and Fernando Torres depart in exchange for a top-class forward.

The west London club fell short of landing Edinson Cavani and Radamel Falcao last summer, but a lack of sharpness up front will surely force Abramovich and Mourinho to bolster their attacking options this January.

What do you think Chelsea need to change this summer? Let us know in the comments section.

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