In the build up to the final fixtures of the Champions League group stage, Chelsea need only draw to seal qualification to the knockout stages.
With the Blues sitting pretty on +8 goal difference, they would remain top of the group providing they draw with FC Porto at Stamford Bridge. Dynamo Kiev will almost certainly beat Maccabi Tel Aviv, who haven’t recorded a single point yet, but probably not by the six goals needed to overtake Chelsea.
In the event of a draw in west London and Kiev winning their game, Porto would exit the competition on inferior goal difference.
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However, if Porto win and Kiev record victory at home, Chelsea will suffer exit from the Champions League.
On September 29, the Portuguese outfit beat Chelsea 2-1 at their home ground, the Estadio do Dragao. The game saw Porto go 1-0 up with a goal from Andre Andre before Willian equalised from a free kick on the stroke of half-time.
Porto would later clinch the win with Maicon's 52nd-minute header, though Chelsea never really looked like taking a point away from the game. Diego Costa and Eden Hazard tried to fight back with efforts that came close but in the final 25 minutes, Mourinho's men looked a defeated team.
A major problem for Chelsea proved to be the pace and power provided by Vincent Aboubakar, Yacine Brahimi and the aforementioned Andre when going forward.
Porto’s solid defence, that has only conceded four goals in 11 league games, also posed an issue for the Premier League champions, unable to penetrate Julen Lopotegui's side's back line.
And with Chelsea's persistent lack of form, it's easy to see Porto stealing victory against a side who have lost to Bournemouth, Southampton and Liverpool at home this season.
The Portuguese team will come to London knowing they need no less than victory or suffer an early exit.
Win, and Chelsea will at last have something to shout about this season; lose, and their abysmal season will take yet another turn for the worse.