For a long time, Chelsea had absolute domination assured over Arsenal.
The team Jose Mourinho built had such a strong psychological edge over Arsenal that Chelsea felt confident going into every game. That lead Chelsea to playing with ease, and building up a great record against them.
The tide has turned in recent years, however, and now Arsenal actually have a sneaky great record against Chelsea. This season the Blues won one game each, and both teams look to have similar flaws a lot of the time.
As talkSport point out, however, there is one place Chelsea do have a good omen in place, however.
The Gunners have faced English teams 6 times in UEFA competitions, and have a record of drawn 2, lost 4.
That includes defeat to Liverpool in 2008, and Man United the year after.
They last reached a final in 2006 when they were beaten by Barcelona, and just last year stumbled in the semi against eventual winners Atletico Madrid.
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So there are good omens and bad for this potentially weird game in Baku – but Chelsea have faith that the old Mourinho spirit will return at the right moment.
This article was most recently revised and updated 3 weeks ago