The Gunners warmed up for this weekend's Community Shield clash against Liverpool with a comfortable 4-1 pre-season friendly victory over third-tier opponents on Tuesday evening.
Mikel Arteta's FA Cup winners are back at Wembley on Saturday and the Spaniard will be pleased to have seen his side get a win under their belts in the build-up to that contest
Arsenal fielded a strong starting XI - featuring the likes of Bernd Leno, William Saliba and Pierre-Emerick Aubameyang - with a youthful bench at Stadium MK and opened the scoring inside five minutes when a mistake from MK Dons goalkeeper Lee Nicholls allowed Mohamed Elneny to fire home from distance.
Nketiah soon doubled that early advantage after good work from Cedric Soares and an incisive Bukayo Saka cut-back, but the hosts were still in the match at half-time after Rob Holding accidentally headed Regan Poole's cross beyond Leno and into his own net.
The second half often lacked fluency due to the number of changes made by both sides, but Arsenal pulled away late on as teenage defender Mark McGuinness headed home from a corner and Reiss Nelson netted from the penalty spot.
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How to watch
TV channel: The match will not be shown live on UK TV.
Live stream: MK Dons are broadcasting the match live on their official YouTube channel.
Prediction: MK Dons 1-3 Arsenal
The Gunners to increase confidence ahead of their Wembley return with a comfortable win in Buckinghamshire.
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25 mins: The players head to the touchline for a first-half drinks break, with Arsenal still boasting that commanding 2-0 lead.
Arteta is eager to dispense some quick tactical advice to his players, as always.
21 mins: The League One side are giving a good account of themselves at the moment and look busy down the flanks, but Arsenal pose a major threat on the counter-attack.
Plenty more goals in this one are possible, you feel.
18 mins: Saliba is called into action to snuff out the danger as Louis Thompson poses a threat inside the Arsenal box.
The French defender makes a good sliding challenge near the byline and the hosts have a corner, which is promptly cleared.
15 mins: MK Dons earn a free-kick in a very dangerous position to the left-hand side of the Arsenal penalty area.
A whipped effort is well held by Leno.
10 mins: MK Dons had settled down after that early setback, looking to play the ball around and patiently waiting for an opening.
However, they are caught out quickly once again, with Cedric Soares leading the charge down the right and sliding in Bukayo Saka, whose precise cut-back picks out Nketiah.
The former Leeds loanee then bends a right-footed shot beyond the despairing grasp of Nicholls.
Arsenal cruising already at Stadium MK.
GOAL! MK Dons 0-2 Arsenal | Eddie Nketiah 10'
5 mins: A nightmare mistake from Dons goalkeeper Lee Nicholls, who races off his line and tries to play a pass to one of his defenders, only to deliver possession straight to Elneny, who shoots straightaway from distance and finds the back of the empty net.
Not a bad way for the Egyptian to start in his quest to impress Arteta!
GOAL! MK Dons 0-1 Arsenal | Mohamed Elneny 5'
4 mins: No early chances to speak of, with MK Dons - who have played four pre-season friendlies already this summer, remember - looking in good condition as they press Arsenal hard all over the pitch.
Maitland-Niles is flagged offside as he looks to get forward down the left flank.
Off and running in Buckinghamshire.