Former Arsenal striker Kevin Campbell says they cannot afford to lose Gabriel Jesus to injury.
After his goalscoring performance in last night's Champions League win at Sevilla, Gabriel Jesus is having a scan on his injured hamstring today.
Campbell told BBC Sport: "If it is a tweak of the hamstring then you don't take risks with it that's for sure.
"Arsenal do have the players who can fill in, but Jesus really is irreplaceable because he makes everybody else better."
On the Gunners' front three, Campbell added: "It really does [look quite something]. Especially in the Champions League.
"Jesus brings so much to the table because he's so unpredictable. You saw last night with [Gabriel] Martinelli's goal where one bit of skill and turn and that perfect pass can take five players out of the game.
"Arsenal needed that because Sevilla is a really difficult place to go and it's a really big win for Arsenal. It was the tie of the group really. Arsenal really produced. They really went for the game and it was a lot better as an attacking threat.
"It was a really good result, really good performance and when they came under pressure, they were able to handle it. It was a really good learning curve for some of these young players."