Arsenal have provided a worrying update on Sead Kolasinac after an injury suffered during Sunday's chaotic Premier League win over Everton.
The Serbian left-back made his first appearance for six weeks against Carlo Ancelotti's side following an ankle problem, but lasted just 18 minutes before suffering a serious-looking shoulder injury during a collision with Djibril Sidibe and making way for Bukayo Saka.
Gunners boss Mikel Arteta admitted after the 3-2 victory at Emirates Stadium that the issue looked "bad" and that Kolasinac - who left the stadium using his shirt as a makeshift sling - was in a "lot of pain" and would need to be assessed by medical staff, but expressed hope that he had avoided a dislocation.
Arsenal issued a fresh update on Wednesday morning in advance of tomorrow night's Europa League last-32, second-leg tie against Greek giants Olympiacos, in which they confirmed that the 26-year-old was dealing with a "significant" right shoulder injury and will undergo further specialist assessments this week.
At this stage it remains to be seen how much more time Kolasinac is now slated to miss.
Fellow left-back Kieran Tierney is hoping to be back in full training by the end of the month after suffering his own shoulder injury in December.
That is the same case for January arrival Cedric Soares (knee), though Calum Chambers is a long-term absentee after rupturing his anterior cruciate ligament last month.
