Manchester City are struggling to sell out their Champions League quarter-final against Liverpool.
Pep Guardiola's side are considered to be among the favourites to win Europe's elite club competition and are on the cusp of winning the Premier League after an excellent domestic season.
But the Etihad club have become notorious for smaller than expected attendances at their stadium.
Tickets for the second leg of their last-eight game against Liverpool went on sale on Monday.