Firstly, course of a season dictates that one of yesterday's attackers will be out for a prolonged period. Secondly, three of yesterday's attackers are relatively young, so it is best to develop them properly rather than run them into the ground. Thirdly, one of our attackers is new to the league and still settling in: Bernardo. If Sanchez can be brought in and play in January, then it makes sense.
Players need proper rest, and just because a player is sitting on the bench and unused doesn't mean that the actual match day and preparation for said match have not taken their toll.