The 'magic touch' - can Silva find it again?

[BBC][Getty Images]The modern game is about more than the 22 men who start on the pitch - it's about all 40 of them in the matchday squad.We have seen plenty of times this season that Marco Silva knows exactly who to bring on - and when - to change games. The joint-record high of 15 goals from substitutes attests to this.But sometimes that magic touch goes missing - and it did on Saturday.Marco took off Ryan Sessegnon before the hour mark against Aston Villa. He was our biggest - and, frankly, o