Welbeck is set to take on his former club at the Emirates Stadium for the first time since his £16 million deadline day move, with Louis van Gaal since claiming that the striker was not up to the same standard as fellow front men Robin van Persie and Wayne Rooney.
However, after scoring five goals in his first 12 games with Arsenal, Oxlade-Chamberlain believes his new teammate has already demonstrated his quality, and has nothing to prove to the Dutchman.
“I don’t think he has got anything to prove. You’ve seen over the years how effective he can be on the pitch,” he told TalkSport. “When he was at United everyone here had massive respect for him.
“We knew that when we played United and Danny was playing that he would be a threat and something for us to look out for.
“He’s been given the chance to play in the role he wants to play and thrives in upfront and he’s been putting in great performances.
“I know how much respect Danny has for Manchester United as a club, the fans and the backroom staff and even the players and manager,” he continued.
“I know how much the club means to him but he’s at Arsenal now and he’s been brilliant so he knows how much it means to us. Hopefully he can put in a good performance and maybe get a goal as well.”
Manager Arsene Wenger has also echoed Oxlade-Chamberlain’s comments ahead of the weekend’s clash, accusing Van Gaal of being too quick to judge the 23-year-old.
“You have to understand Louis van Gaal did not have Welbeck under his command for a long time and it is always very difficult to know the players well when you see them for three or four weeks,” he said at his press conference.
"Wayne Rooney and Robin van Persie have an exceptional goalscoring record. He had two quality players in front of him, so what he needed was a chance
"What is important is that the player makes a good career and has a good opportunity.
"One of the main reasons [Welbeck signed] was that he wanted to play. We spoke about that and that was one of the main reasons why he came here. [To play as a central striker] was not a condition, it was just that he plays.
"You have goalscoring records which are absolutely outstanding from players who play wide or central, that is not the problem. When you are a player, you want to play."