He missed Wednesday's 1-1 draw in the Emirates Cup against Monaco - Arsenal won the subsequent penalty shootout - before Arteta revealed the striker's prognosis.
He explained: "He had a little procedure this morning, he's injured unfortunately. He's had some discomfort in his knee that caused him some issues so they had to go in.
"He's going to be out for a few weeks."
In Jesus' absence, Nketiah led the line for Arsenal against Monaco, scoring the equalising goal shortly before half-time.
The Gunners' number 14 will likely deputise for the Brazilian again when Arsenal take on Manchester City in the Community Shield on August 6.
But in the meantime, the club could secure a deal for one of Arteta's key forward targets.
Arteta has already identified new forward
The Gunners have been heavily linked with Ajax star Mohammed Kudus, with The Independent claiming that Arteta wants the Ghana international to form part of his plan for Arsenal's midfield and favours him over other signings.
Kudus can also provide competition for Bukayo Saka on the right side of attack, and operate as an attacking midfielder if required.
But crucially, he can also play in a centre forward role. As per WhoScored, he played there on six occasions last term, scoring a credible three goals.
In all competitions, Kudus scored 13 goals - which adds weight to Arteta's argument that he would be an ideal fit for Arsenal.
Kudus could deputise for Jesus while the Gunners star is out injured, but could also adapt to other roles once the Brazilian returns to action.
According to football.london, Ajax will demand a fee of around £40 million for the Ghana international - but whether Arsenal are willing to match that figure remains to be seen.
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