Valencia was given just 10 minutes in a 2-1 defeat to City and concedes that he was disappointed to miss out on a starting berth in such a big game.
He said: "They're the manager's decisions, but I was still a bit upset. In such an important game, to be not taken into account as a starter is upsetting.
"Ten minutes is very short for such a difficult game. The important thing is to come on and play, but you become restless for the next game."