The Gunners were beaten 2-0 at home by Newcastle United in the first leg of the semi-final.
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While they can still turn around the contest away from home, Walcott was not impressed with their attacking output.
“What worries me for Arsenal is they are getting excited about set pieces all the time rather than free-flowing football, which they are known for," Walcott said as a pundit.
“We are shying away from it.
“It was a very lackluster performance in the second half. It's going away from free-flowing football and creating chances.
“It is a lack of confidence I think, I think there were a lot of nerves in the stadium.”