Arsenal may be unable to find a date before January to accommodate the rearranged Europa League group game against PSV Eindhoven.
UEFA confirmed that Thursday's planned fixture was postponed due to logistical problems relating to the Queen's funeral. The governing body said that "severe limitations on police resources and organisational issues related to the ongoing events surrounding the national mourning for Her Majesty Queen Elizabeth II" were the cause of the postponement.
UEFA added that "a new date will be communicated in due course" but Mikel Arteta's team, who could also see the weekend's Premier League game against Brentford called off, do not have a spare midweek before November's World Cup to leave both the club and competition organisers with a significant headache.