Arsenal midfielder Mikel Arteta is aware of Chelsea's new stars.
Arteta knows the derby will be a hard game for his team because of Chelsea's other attacking players.
"I knew Oscar from Brazil and Eden from France," explained Arteta. "They have Mata as well - tricky players who are creative in the final third. They can cause you trouble.
"Chelsea are top of the league so that means they are the best and we know it is a tough game."