Bruno Fernandes asked Ole Gunnar Solskjaer to make a tactical change at halftime as Manchester United found themselves trailing Atalanta by two goals on Wednesday.
Goals from Mario Pasalic and Merih Demiral gave the Serie A side a shock 2-0 lead at Old Trafford, before the hosts mounted a spirited comeback in the second half, capped by Cristiano Ronaldo's winner nine minutes from time.
According to The Sun, Fernandes and Ronaldo made clear they were disappointed with United's showing in the first 45 minutes and the former went as far as demanding a tactical tweak.