The Old Trafford talisman has been on good form this season, scoring 13 league goals, though the Gunners captain has netted 18 times already.
However, Rooney is not thinking about this heading into the key clash between Sir Alex Ferguson and Arsene Wenger’s sides at Emirates Stadium.
“Arsenal have been doing well and Van Persie has scored a lot of goals. He is playing really well,” he told ManUtd.com.
“He will be the biggest threat for Arsenal on Sunday. Him and Ramsey are certainly the two who have stood out for them this season.
“There are a lot of top strikers in the league - Van Persie, Aguero and Yakubu is playing well. But Sunday is not about me and Van Persie. It is about us against Arsenal. That is what we will be focusing on.”
The two teams are in different situations but both need the win equally for fear of losing touch with those above.
United are three points behind leaders Manchester City and just two points ahead of third placed Tottenham Hotspur.
Arsenal meanwhile are four points behind Chelsea in the last of the Champions League spots, but the threat from behind that will also worry them – they are ahead of Newcastle United only on goal difference and just a point ahead of Liverpool in seventh.
It is set to be an intriguing clash, with both sides having injury worries and scoring as many goals as they are conceding.