The Poland international has been a fringe player for the Gunners, but he has a huge role to play after Gabriel Magalhaes' season-ending injury.
Kiwior came on early against Fulham on Tuesday and he went on to start against Everton today. He produced a man of the match performance.
The 25-year-old had a passing accuracy of 94 percent with 70 touches. He managed four successful long ball and created one big chance of Leandro Trossard.
Trossard was put through on goal by a brilliant long ball, but the Belgian could not execute a perfect finish. It proved costly in a 1-1 draw.
Kiwior also blocked a Toffees shot in the opening half. It was a commanding display and he should start versus Los Blancos.
Arsenal welcome Real Madrid to the Emirates Stadium for the first leg of the Champions League quarter-final on Tuesday night.