Owen Hargreaves has been impressed by Erik ten Hag's ruthless streak since he arrived at Manchester United in the summer.
Ten Hag has seen his team lose four times already this season, and he has not been afraid to ring the changes between matches to try to find the right balance for his side.
He has already dropped Cristiano Ronaldo and Harry Maguire in the opening weeks of the season, and he has been happy to bring off high-profile players during games as well.
In Thursday night's 1-0 win against Omonia Nicosia in the Europa League, ten Hag hauled off summer signings Antony, Casemiro and Tyrell Malacia in the second half, and Scott McTominay came off the bench to net the winning goal.