The midfielder quickly turned his attentions to this week's UEFA Europa League qualifier against Lokomotiv Plovdiv after defeat to Everton.
“I'm very sad, very upset," said Lucas to the club's webstie. “The feeling is very bad. It's not the way we wanted to start.
“The players are upset because we know how important this game was. The first game of the season and it's so important to start well, to start with three points.
“That's the game. We need to look forward now and try to do better. We know we have the quality to do better, and I'm sure we will.
“We don't have time to cry. We have another important game in three days, and we need to be ready."
Lucas is well aware of the stakes as they take on the Bulgarian Super Cup winners in the second qualifying round of the UEFA Europa League. It's a one-off tie, no second leg, winners on the night going through to the third qualifying round.
“It's only one game, and if we lose, it's bye-bye," said Lucas. “We need to go there with the right mentality, very strong in our minds and go there to qualify, because it's a competition we want to win, and we have the quality to win."