William Gallas, Petr Cech and Cesc Fabregas.
What have they all got in common?
They’ve all played for both Arsenal and Chelsea in recent years.
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But there is another player who wishes he could join that list - Demba Ba.
That’s because the Senegalese striker still regrets the day that his proposed loan move to the Gunners fell through.
Ba had been at Stamford Bridge for one season and had been linked with a move to the north London club in the summer of 2013.
However, Chelsea boss Jose Mourinho prevented Arsenal from sealing the deal because he was reluctant to help a Premier League rival - much to Ba’s frustration.
"I think back to the day when Jose Mourinho blocked my Chelsea loan at Arsenal," Ba told France Football, per Sky Sports.
"It was the time of his return to the club, and I think it would have been a very good move. It happened on the last day of the transfer window.
"I was in Paris, at rest, and Arsenal representatives called me to tell me it was going to happen.
"I then came back to London for the medical. Upon arriving, I was left surprised that Mr Mourinho had blocked my move to Arsenal. Mesut Ozil arrived, and to strengthen a competitor like Arsenal was very complicated if it worked," he added.
Ba had experienced a frustrating debut campaign in west London, only playing 14 times in the Premier League, scoring twice.
When Arsene Wenger expressed his interest, Ba was keen to move but understood Mourinho’s behaviour.
"I understand Mourinho's decision as a coach, but as a player, you are frustrated," he said.
While Ba was frustrated that he wasn’t allowed to leave for Arsenal, Liverpool fans will be equally annoyed.
That’s because Ba, who only scored five league goals in that campaign, scored against the Reds at Anfield to destroy their chances of winning the Premier League.
But with Ba being used as a bit-part player once again in his second year at the club, he decided it was time to leave.
Regrets leaving Chelsea
However, he hints that he left the club at the wrong time with Chelsea lacking striking options.
"Then, the second turning point comes when I decided to leave Chelsea for Besiktas. Mourinho came to ask me to stay, promising me more playing time next season," he revealed.
"But upon returning from vacation, I decided not to follow his request. I thought it was probably going to be like the last season.
"In the end, there was only Diego Costa and if I had been there I would have actually played more."