Aaron Ramsey will be out at least six weeks and possibly up to eight with a hamstring injury.
Arsène Wenger said he hopes the midfielder will return in four weeks and, “if all goes well, three”, but the estimate is believed to be optimistic. Wenger is notorious for placing three-week time frames on muscle injuries.
Ramsey injured the thigh muscle in his left leg at West Ham United on Boxing Day last season and was out for over three months.