The 19-year old Wales international suffered a badly broken leg against Stoke City in February and was originally expected to be out for at least a year but his recovery is going to plan and he could be back earlier according to Gunners boss Arsene Wenger.
"He has started to have a little, little jog this week," said Wenger. "He will be back of course but at the moment, when you start to run, it is still about three months.
"Short term, he will not be available but he will be this season.
"Now we have to count three months. If he is back in November, he has done well."