Mustafi had a great start to life as an Arsenal player, initially rejuvenating the back four and forming a good partnership with Laurent Koscielny.
Even Paul Merson admitting "This might sound a bit silly" when giving his justification.
Uefa has confirmed that a Europa League space for English teams will go to the club that finishes seventh in the Premier League, provided that Southampton do not unexpectedly win the FA Cup.
Wenger's men played out a 2-2 draw with CSKA Moscow in mid-week to qualify for the semi-finals of the Europa League.
They have fared a little better on the road in continental competition, but Keown admits that struggles away from Emirates Stadium could end up costing Arsene Wenger's side dear - both at home and overseas.
After taking the lead, the visitors took control of the game for the next ten minutes or so and they nearly got a second goal when a good passing move ended with Alex Iwobi forcing a good save from Martin Dúbravka.
But it was Newcastle who landed the knockout blow in the 68th minute. The Gunners won by four or five and played some unbelievable football.
"It's the away form that is the worst".
When did Arsenal suddenly have this reputation for expecting and getting entertaining football?
"I'm glad the way they did it, because it was sort of fizzling out".
Newcastle United captain Jamaal Lascelles has heaped praise on head coach Rafael Benitez, describing him as a "special manager". But almost two years after Wenger chose to spend £35 million on the former Valencia player, it's increasingly clear Mustafi has only added to Arsenal's chronic defensive problems rather than solve them.
The 20 top-flight teams voted last week against introducing the system for the league's 2018-19 season after trials in English cup competitions received mixed reviews.
Petr Cech has warned Arsenal they need to win all their remaining games if they are to climb into the Premier League's top five.
'I guess that means the top-six. "He wants to stay at Newcastle, he's got a year left, and he's had other offers", the pundit revealed to talkSPORT as quoted by HITC. 'I'm going to put this to bed straight away because Newcastle fans would be laughing at you two muppets right now. They got themselves in front, City struggled to react and then once they were in front with the speed they have.
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