Manchester United boss Erik ten Hag explained Luke Shaw's halftime substitution for their win at Aston Villa.
Ten Hag says the decision was made as a "precaution".
He explained: "Precaution. He had some complaints and we can't take any risks with him because he's had any injuries in the past. We'll have to see how it goes in the next few days.
"It's not an advantage to lose him, everyone knows my philosophy to have left-footers at left centre-back and left-back.
"We have to make compromises and it is not to our advantage."