Under returning boss Jose Mourinho, Chelsea enjoyed a rather curious - others might say slightly baffling - summer transfer window. While his notable flair and attacking abilities should undoubtedly prove to be a positive factor at Stamford Bridge, the £30 million capture of Brazilian playmaker Willian was a somewhat puzzling addition given that the club are currently blessed with a talented glut of similar options.

However, whatever the merits of Willian's signing, it is his former Anzhi Makhachkala teammate Samuel Eto'o whose recent arrival should provide one of the Premier League's more intriguing sub-plots over the course of the current domestic campaign.

Throughout a colourful but ultimately successful career, Eto'o has proven himself to be a deeply divisive figure. This week, footballing icon and former Anhzi teammate Roberto Carlos, whilst remaining diplomatic, was less than complimentary about the Cameroon international and Chelsea supporters should be concerned about those comments.

Speaking about their time together with the wealthy but troubled Russian outfit, Carlos stated his belief that Eto'o, while a fine player and ultimately a good person, had the potential to have an adverse impact upon dressing room relations.

Carlos, a widely respected former Brazilian international and World Cup winner, explained that he considered quitting the club due to the striker's repeated interference with his leadership role at Anzhi.

Such potential for dressing room disharmony could prove to be particularly damaging at a club like Chelsea. One of Mourinho's most obvious trademarks - and indeed one of his most notable strengths - is his uncanny and commendably clever ability to instil an 'us against the world' mentality within the dressing room.

The Portuguese is frequently able to garner the very best from his players and foster an admirably strong resolve by adopting such an approach. This was certainly achieved during Mourinho's fruitful first spell in West London, and evidence of an extremely similar ploy was there for all to see in his comments concerning Brazilian midfielder Ramires' red card against reigning Champions League winners Bayern Munich.

Chelsea's squad, although now far more balanced with the addition of quality young talent such as midfield trio Oscar, Eden Hazard and Kevin de Bruyne, still features a number of elder statesmen who will presumably be very keen to avoid a situation similar to that of what apparently transpired at Anzhi.

The likes of John Terry, Frank Lampard and Petr Cech are experienced Premier League stalwarts who, like Carlos, would surely not take particularly kindly to a new addition attempting to exert too much arrogant influence over proceedings as Chelsea look to mount a credible title challenge this season.

The Cameroonian might eventually prove his doubters wrong, maintain a relatively low-profile and enjoy a prosperous spell at Stamford Bridge. But, in my view, regardless of his reduced price, he evidently represents a considerable risk to dressing harmony that is just not worth taking.

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