Kolasinac is sidelined for around ten weeks while Monreal returned from the World Cup with a knee problem and only just returned to training last week, which led to Ainsley Maitland-Niles filling in against Manchester City.
However, the youngster hobbled off in the first half following a tangle with Kyle Walker and was replaced by Stephan Lichtsteiner, naturally a right-back, handing Arsenal further concern ahead of this weekend’s trip to Stamford Bridge.
“Nacho started working with the group yesterday, maybe he can arrive for the next match. Every day is important to know how they are.”
After a tough start to the season, Arsenal’s fixture list becomes more settled with the hosting of West Ham before back-to-back away games against Cardiff City and Newcastle United.