Former Arsenal captain Cesc Fabregas suffered with his former team-mates at seeing the Gunners thrashed 8-2 at Old Trafford. The Spaniard, who joined Barcelona last month, said: "I watched the match against Manchester United on television and it was difficult.
"I suffered during this match and especially because of the enormous rivalry between the clubs.
"But I am convinced that the squad will improve for the next matches.
"I will always have important feelings with the Gunners. I am a fan through the good and bad moments."
Fabregas also paid tribute once again to Arsenal boss Wenger, saying: "I hope that I can transfer the lessons Wenger has taught me to my new work at Barca. I will always be grateful to the coach."