Alex Oxlade-Chamberlain is facing surgery in the summer if Arsenal are unable to get to the bottom of his continued groin problems.
The 21-year-old last played on 9 March in the victory over Manchester United at Old Trafford and was initially ruled out for a month - he was due for a return around now but has suffered a further setback and will be out for at least another two weeks.
Arsenal believe the midfielder will play again this season but he is facing an important couple of weeks; if he suffers another setback Arsenal may have no option but to send Oxlade-Chamberlain for surgery.
"It is taking a bit longer than I thought because he has a groin inflammation. It is related to everything before," said Wenger.
"I hope it does not become a long-term problem, but he faces a hurdle this week in training. We will see if he has recovered well.
"The end of this week and the start of next week are important to see if he got rid of that inflammation. It is not his hamstring anymore. It is groin inflammation."
There is good news for the Gunners however, with Wenger stating that he expects Mathieu Debuchy, Jack Wilshere, Mikel Arteta and Abou Diaby to all be fit for the Gunners' Premier League match at Burnley on Saturday.
Laurent Koscielny and Wojciech Szczesny will both face late fitness tests for the game.
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