Ruben Amorim ordered some of his Manchester United stars to undergo a full training session immediately after their 2-1 win over Leicester on Friday.
After a disappointing 2-0 defeat by Crystal Palace last weekend, United welcomed the return of Ruud van Nistelrooy to Old Trafford as they faced his Foxes side in the FA Cup fourth round.
Once again, however, Amorim watched on as his side produced a lethargic display in the first half, with the visitors taking the lead on the brink of the interval through Bobby De Cordova-Reid.