Tolaji Bola joins Rotherham United
The 22-year-old becomes the League One Millers' sixth summer arrival and the fourth new recruit in less than a week.
The Camden-born 22-year-old didn't make a senior appearance for the Gunners but racked up 50-plus appearances for their under-23s side.
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Hide AdHe already has experience of the third tier, having played 12 times for Rochdale during an October-to-January loan spell at Spotland last season.
Rotherham have long needed genuine competition for Joe Mattock on the left flank and the Millers are hoping Bola, who has been signed for an undisclosed fee, will fit the bill.
The England youth international, who can also fill in at centre-half, had been due at AESSEAL New York Stadium last Monday.
A hold-up at the Arsenal end prevented that happening but there was never any doubt that the deal would still go through.
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Hide AdThe Millers, who are at home to Accrington Stanley in the first round of the Carabao Cup this evening, have also brought in goalkeeper Josh Chapman, central defender Rarmani Edmonds-Green midfielders Hakeem Odoffin and Ollie Rathbone and winger Shane Ferguson as they bid for a third successive promotion from League One under manager Paul Warne.