Arsenal midfielder Alex Oxlade-Chamberlain will be sidelined for a few weeks, manager Arsene Wenger has revealed. The England international injured a knee in a challenge with Javier Mascherano in the Gunners 2-0 defeat at home to Barcelona on Tuesday and was replaced by Theo Walcott five minutes into the second half.And Wenger admitted at his media conference ahead of the Super Sunday clash at Manchester United the injury is more of a concern than at first realised. His injury is quite serious and keeps him out for a few weeks, said Wenger. He is seeing a specialist at the moment and hopefully we will have good news. He is out for a few weeks, for how long exactly I dont know.When asked if the players injury setback could affect his chances of making Roy Hodgsons England squad for Euro 2016, Wenger added: I dont know but I am cautious. Oxlade-Chamberlain was injured against Barcelona Its a new injury. When he has been cut in two by Mascherano, he did his knee. We have to see how big the damage is and well see more later.I dont think it was a malicious tackle, it was fully committed. Lets hope we have good news that it is only two or three weeks, not six or seven.Striker Danny Welbeck has featured in the Gunners last three matches after 10 months out following knee surgery but Wenger would not confirm him as a starter against his former club. Hes been out for a while and we need to be cautious with Danny Welbeck, he said.I havent picked my team for Sunday yet but he is back in the squad. He is not completely over his knee problem. Hes doing extremely well and very fit, but I have to analyse that as well.Wenger also confirmed defender Gabriel will have a scan on a hamstring injury that has seen him miss Arsenals last three matches. Dashing Danny Arsenal need Welback impact Watch Manchester United v Arsenal on Super Sunday. Coverage begins on Sky Sports 1 HD at 1pm. Or watch for £6.99 without a contract, on NOW TV. 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Johanna Konta may have felt star-struck rubbing shoulders with Britains best Olympians but at the US Open she is no longer an unknown quantity.Konta plays Americas Bethanie Mattek-Sands in round one Monday, looking at least to replicate her breakthrough run to the last 16 here 12 months ago.Then, Konta was a surprise package, having previously won only one grand slam match in her career, but she has shot to fame since, rising to 14th in the world and reaching a major semifinal at the Australian Open in January.Konta, however, has kept her feet firmly planted on the ground and at the Olympics in Rio last month she could barely believe it when recognised by her fellow athletes -- most notably golfs gold medallist Justin Rose.Justin said to me, youve been having such a good year and I thought, my God, he knows who I am!, Konta said. I had a couple of those moments, surprised that people know the sport I play to begin with.I was definitely one of the more social ones, I made an effort to sit down with other athletes, I didnt just stick to our group. We were sitting with the boxers, the rugby players, with the hockey players.I tried to learn as much as I could about the other sports because going in there I really didnt have any idea about them Im ashamed to say.Konta lost in the second round of the womens doubles and quarterfinals of the singles but admits she remained in Olympic mode even while playing in Cincinnati last week.I was well pprepared for the Olympics in the sense that everyone told me it was nothing like anything youve experienced before and it was just that, Konta said.ddddddddddddIt was very strange going there and incredibly strange leaving because you just get immersed in this bubble of sport and competing.There are so many competitive vibes there that it was quite shocking to the system. To be surrounded by so many athletes -- I was definitely having withdrawal symptoms when I left and still was in Cincinnati.Back in grand slam mode, Konta will do well to escape a fiendish quarter of the draw in New York that includes Garbine Muguruza, Madison Keys, Svetlana Kuznetsova, Belinda Bencic and Olympic champion Monica Puig.First, she must overcome Mattek-Sands, a local favourite who may still be riding her own Olympic high after winning gold in the mixed doubles with Jack Sock.Mattek-Sands and Sock beat Konta and Jamie Murray in the first round.We hadnt played each other ever and now we are playing each other twice in three weeks, Konta said.She is playing very well, she has an incredible amount of experience, she is coming off the back of something that is incredibly inspirational and life changing.I think its no secret that a lot of American players play better here. Im expecting a very inspired Bethanie and I will do my best. ' ' '