Often regarded as the master of getting his tactics spot on for a one-off game, Jose Mourinho needs to be at his meticulous best to ensure a Chelsea victory over Atletico Madrid to reach the Champions League final.
However, Diego Simeone also has some options in the away dugout at Stamford Bridge and below are three decisions that may determine the result.
Chelsea’s odds are 6/5 to win in the 90 minutes, with the draw available at 11/5 and Atletico 9/4 to secure victory in London.
Gabi absence not as critical as it could be
There is no doubt that the loss of Gabi to suspension will be noticed here by Atletico, as he averages more passes than any of his teammates this season per game and is also their chief presser from midfield.
Pressing shouldn’t prove so critical here as Chelsea don’t really have a deep-lying playmaker that will try to dictate the game, with his logical replacement Tiago slightly more defensive with his positioning.
Slightly like Chelsea at Liverpool, Diego Simeone will probably set up with two holding midfielders that will help if the chosen tactic of Mourinho is to spread play quickly to the wide areas.
Villa and Garcia should start in advanced positions
Perhaps the biggest decisions for Simeone is which two players should start closest to Diego Costa in attack, with Arda Turan, David Villa, Diego and Raul Garcia all battling for places.
Villa’s attacking movement and desire to run in behind should win him the nod off Costa and then it is whether Simeone prefers an extra aerial threat or a more creative influence from the right.
Garcia offered an outlet in the first leg with his ability to win headers and as Chelsea are liable to line up fairly conservatively, this may prove of use again with Villa and Costa buzzing around for knock downs.
Eto’o a better option over Torres in attack against deeper defence
Despite scoring on each of his last two starts and in four of his last six Chelsea appearances, the one certainty here seems to be that Demba Ba will start from the bench.
Ba, Fernando Torres and Samuel Eto’o have all scored three goals in the Champions League this season, with the latter often being the preferred choice of Mourinho.
The fact he has hit the target with 15 of his 16 shots could be significant, while he is the sensible option against deeper defensive lines, given his better link-up touches and drifts into space.
If Mourinho believes that Atletico will defend high up the pitch, which is unlikely, then Torres would represent the shrewder move, especially if replicating his display against Galatasaray earlier in the competition.