Ahead of manager Unai Emery's pre-match press confernce, the medial department issued a statement which entailed the recovery timetable of all their injured player.
Arsenal will have to make do without the services of Ainsley Maitland-Niles and Carl Jenkinson for upto two months after the club on Thursday revealed that the duo had suffered injuries.
Maitland-Niles limped off the pitch in the first-half of Arsenal's 2-0 Premier League opening day defeat to the reigning champions and now doctors have confirmed that he has suffered a "small fracture" to his left calf bone.
The 20-year-old versatile starlet will miss six to eight weeks after fracturing his left fibula, Arsenal have confirmed.
Wantaway full-back Carl Jenkinson is also now absent due to injury after picking up "a significant sprain to his right ankle".
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Somebody told me the Chelsea coach, Maurizio Sarri, had said they need a minimum of three months to build their team. If we know we are going to take some conscious risk, it's sure he is not going to play.
That will likely mean the 26-year-old will not be leaving on loan to a Championship club this summer.
It is a boost for the Gunners who have lost the two left backs to injury with Kolasinac set to be on the sidelines for two months with a knee injury as well as Niles.
Arsenal also said captain Laurent Koscielny is now expected back in training in November, with earlier estimates having aimed for a December return.