The Argentine signed for the Red Devils for a mega transfer fee in the summer of 2022, with Arsenal also bidding for him at the time.
While the Gunners made other signings at the time, they could have secured Martinez much earlier.
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Arsenal manager Mikel Arteta was also offered Martinez for a tiny fee 12 months earlier.
According to The Sun, Arsenal had reservations about his height and may have chosen other targets.
However, his impressive displays at Ajax led to more concrete interest, but United won the bidding war in 2022.