Shaw has been out of action since the 2-0 defeat against West Ham on December 23rd but he returned to training earlier this week.
United had planned to start Shaw, with Diogo Dalot at right-back.
However, Shaw ‘dropped out’ of selection on Sunday morning and Ten Hag felt it was too late notice to switch his gameplan, which meant Wan-Bissaka deputised at left-back with Dalot on the other flank.
‘It is not the first time [Wan-Bissaka has played at left-back]. On Monday at Wigan he played part of it there,’ said Ten Hag.
‘We expected Luke Shaw [to play]. We trained with Shaw in our preparation but this morning he dropped out.
‘So to change then back from what we trained and our gameplan….it would be to adapt too much.
‘So we decided to put Aaron on the left with Diogo on the right side.’
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