The injury to Maitland-Niles was obvious but now, the club has confirmed the extent of the knock picked up by the 20-year-old.
"Maybe not especially at left back, but he was playing well in the first 25 minutes on Sunday".
Kolasinac should return to training from his knee problem in October, while club captain Laurent Koscielny continues his recovery from Achilles surgery.
The Gunners head to Chelsea on Saturday, and provided an injury update on Thursday morning, ahead of Emery's scheduled press conference.
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Sarri insisted that the 31-year old has a long life at Stamford Bridge as he is very compatible and complete defender. Do you really want me to tell you?" Yes, because we play different football now, with a different playing style.
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Meanwhile, defender Carl Jenkinson is expected to be out for a similar length of time as his colleague because of "a significant sprain to his right ankle".
Arsene Wenger's successor faced criticism following Arsenal's attempts to play out from the back in his first league game in charge of the Gunners.
France worldwide Laurent Koscielny, who missed his nation's World Cup-winning campaign with an Achilles tendon tear, is on the mend and is expected to return to training in November.
The good news is that Nacho Monreal is back in training, but I doubt very much whether he will be fir for the Chelsea game, and I guess it is possible that Danny Welbeck could fill in at left-back...