Players are capable of playing twice a week, of course, but tired players cannot compete on equal terms with players who have had a longer rest. This gives the clubs with large squads an advantage. However, these clubs often have even more matches, in Europe competitions and domestic cups.
We do need a win tonight to lift us after the weekend. Newcastle may have lost on Saturday, but they have had an extra day to recover. With enforced changes for Walcott and Gana tonight, perhaps Monday would be a better time to give someone like Keane a rest in this busy run. As Bernard, Gomes and Mina have not played as many games, they are not yet in need of a rest.
But players cannot be expected to contribute fully to every game in December and over the New Year. Fans can take game one at a time - we want to see the strongest team play every game. Silva, however, must plan a little further ahead.