The two were having an animated discussion as they went into the locker room at half time, with Lloris furious at Son.
But Moura thinks it is born out of a desire to win, which is what the team needs to improve its results.
"It's completely normal in a team," Lucas told Sky Sports.
"I think every team has this.
"It shows that we want to win, we want to be in a better position.
"We know that we can do better, we know our quality.
"When we get angry with each other on the pitch, it's to show that we can do better."
"We still have five games to play and we still have the opportunity to qualify for the Champions League," he continued about the rest of the season.
"We know it's very, very difficult, but it's not impossible. We know, in football, anything can happen.
"If we qualify for the Europa League, it's not our objective because we want Champions League but it is also a beautiful competition."