Former Arsenal vice-chairman David Dein has urged the club's fans to stop criticising manager Arsene Wenger.
The 63-year-old has come under intense pressure over the past couple of seasons from the club's supporters, with the Gunners struggling to challenge for honours while selling their top players such as Cesc Fabregas and Robin van Persie.
Dein, however, said he finds chants such as 'you don't know what you're doing' aimed at Wenger at the Emirates 'very hurtful'.
"People have got short memories. They seem to forget what Arsene has achieved for the club," he told The Sun.
"Arsenal is respected around the world and much of that is because of Arsene with the results and the players he has brought in and developed.
"People underestimate him. He has transformed the club. He has done a phenomenal job.
"I always used to call him the miracle-worker. He waved his magic wand and he delivered.
"But it's getting tougher because the competition is getting stronger."