Champions League preview: Chelsea focus on the hole behind Alves's Michael Cox uses the StatsZone app â from FFT & Opta, available now â to preview Tuesday's Champions League semi-final second-leg...

One of ChelseaâÂÂs better players last week was Ramires, who was moved across to the left of midfield and told to track Daniel Alves up and down the touchline, before quickly breaking past him when the ball was won. Ramires didnâÂÂt do the latter too often â but once was enough, as he set up Didier DrogbaâÂÂs winner (the yellow arrow indicating the assist).

Ramires also had the energy and positional sense to help out defensively, shown by how often he helped break up a Barcelona attack. But on the other flank was Juan Mata â less energetic, less able defensively, more creative. Although he filled in well on the right, tucking in and making Chelsea narrow in midfield, he didnâÂÂt actively do anything in a defensive sense. His contribution was limited to a handful of passes, and one wayward shot.

MataâÂÂs place in the Chelsea side at the Nou Camp is not assured. itâÂÂs likely heâÂÂll be picked to give Chelsea some level of attacking threat and help make their passing flow, but Michael Essien performed well at the weekend and would be a stronger defensive option.

ChelseaâÂÂs intention to attack into the space behind Alves was also summed up by their passes in the final third at Stamford Bridge. As the graphic on the left below shows, the majority of their passes were down that side, particularly long balls in behind the full-back.

Compared to their weekend performance against Arsenal, itâÂÂs a huge difference. At the Emirates they played their more natural game, attacking down each flank equally â albeit with a different set of wingers, Saloman Kalou and Daniel Sturridge.

ChelseaâÂÂs attacking route should depend on BarcelonaâÂÂs formation â if they play a back four and Alves pushes on, then breaking in behind him is the logical option. But if Pep Guardiola chooses a back three, there will be gaps on both flanks, as Real Madrid showed on Saturday night.

Stats Zone is a free-download app from FourFourTwo powered by stats from Opta, updated LIVE during the game, covering Champions League and Premier League.

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