Everton came from behind to win thanks to Bernd Leno's own goal on 83 minutes.
“We should have killed the game,” Silva explained afterwards. “We should have scored three or four goals (in the first-half) at least.
“I know Everton created one good chance from a corner too, but there were a number of chances that we created and clear, clear chances to score more goals.
“Second-half, we stopped doing the right things. We spoke at half-time and expected a normal reaction from a side like Everton – we expected them to make some steps forward.
“We started to lose control of the game. Of course, we tried to react from the bench but we lost control of the game and we have to blame ourselves, definitely, for the way we lost this afternoon.
“We were too soft defending our box. It's a moment for us to blame ourselves and to really look at ourselves because you want to prove your quality. It was a good chance for us to prove our quality, but we have to prove it for 90 minutes, not just 45.”