The Dutchman has scored six goals in his past four league outings, including a match-winning double in the 3-1 victory over Stoke city on Sunday after coming off the bench, and Djourou is hoping he can remain in fine fettle as he and Gervinho are beginning to strike up a deadly attacking partnership.
"Robin did [make the difference]. It is under no question how important he is to the team but I think Gervinho also had a great game," the Swiss international said.
"He got two assists for Robin and the two combined very well together. It was a great sub by the boss.
"We have to keep him [Van Persie] like this, it is good. He came on after being rested a little bit and made the difference again. It shows you how important he is to the team."