The 20-year-old England international netted the first goal for the Gunners on Wednesday night as Arsene Wenger's side coasted past Villarreal into the Champions League semi-finals.
And like his manager, Walcott is now relishing the prospect of facing holders Manchester United in the last four.
“It will be difficult against United,” he said. “But we play them regularly in the Premier League and do very well against them.”
Arsenal have already beaten the Red Devils in their only meeting so far this season, with Samir Nasri bagging both goals in a 2-1 win at the Emirates Stadium.
And Walcott believes Sir Alex Ferguson's side have every reason to be scared of a Gunners side currently in their best form of the campaign.
“There is a lot of confidence in the dressing room – everyone is buzzing," he said. "We feel every team are scared of us as soon as we step on the pitch. It’s great to play when things are going like that.
“We are playing brilliant football and scoring goals from all sorts of positions, which helps the team. We are defending well and even though we have players out injured, others are coming in and doing just as good a job.”
And Chelsea don’t worry Walcott either ahead of their FA Cup semi-final clash at Wembley on Saturday.
“We will be looking to utilise their weak spots,” he said. “If we play like we did against Villarreal, then I’m sure we’ll get some goals.”
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