Arsenal boss Arsene Wenger says Chelsea midfielder Cesc Fabregas should not be given a hostile reception on his return to the Emirates Stadium.
The 27-year-old left the Gunners to join Barcelona in the summer of 2011 with Arsenal turning down a first option to buy him last summer.
And Wenger admits it was disappointing to see the Spaniard leave after eight years at the club.
"The regret I have is that he wanted to leave here," Wenger said.
"This club and myself had a very positive influence on Cesc's life. I want every player to be respected, and [I want] Cesc Fabregas when he comes to the Emirates on Sunday to be respected like he deserves."
Meanwhile, Wenger opted not to comment on his turbulent relationship with Chelsea manager Jose Mourinho.
"I don't know and I don't want to talk about that," he said.
"What is important is when the game starts at four o'clock, to have a great game.
"That's what English football needs, to know that Arsenal against Chelsea is a big game and is not about the relationship between the managers."