Why is Henrikh Mkhitaryan wearing number 77 at Arsenal in Europa League but 7 in the Premier League?
ARSENAL visit Atletico Madrid as they continue their quest for the Europa League.
But you might be wondering why Henrikh Mkhitaryan has an odd number on his jersey.
It's all down to Uefa, who have rules for almost everything.
Why is Henrikh Mkhitaryan wearing number 77 shirt for Arsenal in Europa League?
THIS is one of Uefa's strange rules.
One bizarre ruling is that two players cannot wear the same shirt number in the same campaign.
Alexis Sanchez was the previous incumbent in the number 7 shirt, before making the switch to Manchester United.
So Mkhitaryan has had to make the switch to 77.
Club record signing Pierre-Emrick Aubameyang isn't in the squad due to another Uefa rule.
Since his former club Borussia Dortmund dropped down into the same competition, the forward will not be able to play for Arsenal - despite not playing in it already this season.
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