The 20-year-old was keen on joining the Saints last summer and he was angered by United’s refusal to release him, particularly after the deadline day capture of Alex Telles.
Ole Gunnar Solskjaer opted to keep Williams to keep depth in his squad but the youngster was limited to just four Premier League appearances, having made 17 in the previous campaign.
Williams was understandably frustrated that he was kept at the club and feels the last 12 months of his career have been put on hold, particularly as the Red Devils dismissed a second approach in the January transfer window.
United agree and the Athletic claim the Red Devils are now willing to let the youngster join the Saints until the end of the 21/22 campaign.
Solskjaer hopes to sign Atletico Madrid star Kieran Trippier as competition for Aaron Wan-Bissaka at right-back, which would further limit Williams’ chances.
The youngster emerged from United’s academy as a left-back and he initially stood in for Luke Shaw 18 months ago after the England international got injured.
But United feel that the 20-year-old is best served by regular football elsewhere and that’s a positive for the Saints, who recently lost Ryan Bertrand to Leicester City.
MORE : Houssem Aouar responds to Arsenal transfer rumours after ‘skipping Lyon training’
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