Cape Town - Arsenal manager Arsene Wenger has admitted his concern over the fitness of midfielder Alex Oxlade-Chamberlain, who is nursing a groin injury. The 21-year-old played in Saturday's 4-1 victory over Newcastle, despite nursing a groin problem, and appeared to limp off the pitch after being substituted in the second half.Wenger admits that losing the England international to injury ahead of the busy festive period is something he cannot afford, but is hopeful that a bit of rest this week will help Oxlade-Chamberlain recover."We cannot afford to lose him at the moment. I hope it is nothing bad," Football411 quotes Wenger as saying."He had a little bit of inflammation before the game. I took him to Galatasaray and maybe two games was a lot for him."Wenger will give several first-team regulars, including Oxlade-Chamberlain, a few days off from training this week as he looks ahead to Sunday's clash with Liverpool at Anfield.He added: "When you count the number of games with the Champions League, to have two or three days at home over Christmas is important."Most of them will stay in England because their families are here."