Cesc Fàbregas has a place in his heart for the Gunners after he rose to become captain at the Emirates but is now playing on the other side of London wearing a blue shirt.
In 2011, the Spain international left Arsenal for his childhood club Barcelona and signed for Chelsea in the summer after Arsene Wenger refused to bring him back to the Emirates.
However Chelsea manager Jose Mourinho told reporters that, the former Arsenal captain won`t forget Arsenal but is now committed to the Blues.
"Fàbregas will never lose his respect and connection with a club where he arrived as a kid and left as a top player.
"Arsenal made him. I wouldn't be happy if he came here saying he didn't care about Arsenal and that he forgot all that and now it's just about Chelsea - but I think he loves Chelsea already.
"He's so happy: the way he plays, the way he's a member of the squad, the way he lives in this little 'blue village'. It is like he's been here for a long time.
"If you ask him now if he regrets the move, I'm sure he’d say no. If you ask him if he'd choose a different option, he’d say no. And if you ask him where he thinks he'll be in five years' time, he'd say he sees himself here in five years' time. He is Chelsea.
Mourinho continued: "I wanted him because I know the player he is and I knew he was good for the philosophy we wanted for the team."
"He's one of not many players who can play as a No.8 or a No.10 so gives me chances to play him in both positions and build a midfield knowing that. This, plus the fact that he was made in England and played for so many years in English football, that's a plus. He doesn't need that adaptation. He was coming back home.
"We knew he was perfect for us. We tried. We tried hard and we succeeded and he's been phenomenal."
Mourinho also showed no interest in whether the Spanish midfielder celebrates or not if he scores a goal against his former club on Sunday at Stamford Bridge.
"In this game, he should score," the Portuguese remarked. "Then I don't care whether he celebrates or not," Mourinho said.
"When my Inter scored three times against Chelsea, I didn't celebrate but you can't imagine how happy I was.
"The point is not whether you celebrate or not but control your emotion and not celebrating is nice. Show some respect. But if you can't control your emotion, you can't. It's alright."