Maguire started for Shaw in United’s 2-0 win over Leeds United at Elland Road on Sunday as Raphael Varane rested ahead of the trip to Barcelona.
But it was only his fifth start of the season in the Premier League, a stark representation of his place in Ten Hag’s thinking despite captaincy.
With Lisandro Martinez suspended for Thursday’s game at the Nou Camp, Maguire could start back-to-back matches alongside Varane.
But Shaw is the most likely partner due to his being on the left flank, with Tyrell Malacia keeping his place at left-back.
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