Emmanuel Frimpong will be out for "six to nine months" after injuring his cruciate knee ligaments in training this week.
The powerful 18-year-old midfielder figured heavily in pre-season and according to Arsène Wenger, was likely to see first-team action during the campaign. Unsurprisingly he described the news as "a massive blow" when he spoke to TV Online on Thursday.
This comes a day after it was announced that Samir Nasri underwent surgery on his own knee problem. Thankfully he will be out for just a matter of weeks.
"Samir's injury is a blow for us and a blow for France aswell," said Wenger. "He was continuing his natural progression and had a very good pre-season.
"But we have had another blow with Emmanuel Frimpong. He has done his cruciate in training. That is a massive blow. A cartilage is three to four weeks but a cruciate like that one Frimpong did yesterday is six to nine months.
"I rate him highly and I still have a lot of faith in him but we will miss him for six to nine months."
noooooo :( i thought he had a great preseason and was looking forward to him playing more first-team football :/ best wishes for a speedy recovery to him