"I have never seen Arsenal do that in all the years I have been there." said Walcott.
"A lot of teams leave it until last minute.com so it was interesting to see.
"We got rid of two great players but we've brought a few in and I look forward to seeing them on Wednesday.
"New faces tend to get everyone bubbling. We all have to lift our spirits and hopefully those new signings will do the job.
"They've had so much experience. Arteta in particular is a fantastic player. He can definitely spot a pass and I am looking forward to playing with him."