Arsene Wenger has selected three centre-halves for Arsenal's match tonight
The Gunners have won just one of their last five Premier League games and are desperate get a result against Boro.
As a result Arsene Wenger has opted for a system with three at the back – the first time since 1997.
Arsene Wenger plays bizarre new formation against Middlesbrough Mon, April 17, 2017
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We will of course have to defend better as a team
And the Frenchman has claimed he has done so to offer them more defensive stability – particularly in the air.
"We weren’t solid defensively [against Crystal Palace]," Wenger said.
"We will of course have to defend better as a team.
"In the last two games away from home we’ve had a lot of the ball and didn’t create a lot. Let’s try to come back with some defensive stability."
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And when asked about the three at the back, he added: "We adapt a bit and play with three centre-back yes.
"Recently we’ve lost a lot of direct fights centrally and so it will get us a bit stronger in the air."