Portugal duo involved in training fight
During one drill, winger Quaresma was pushed to the ground by Lopes and had to be pulled back by teammates when he retaliated by kicking at the defender's legs.
Defender Ricardo Costa stood in front of Quaresma to calm him down while coach Paulo Bento also got involved.
"It's just normal things that happen in training," Costa said.
"Things got a bit heated between two players. We're pumped up, we always want to win and sometimes small things happen.
"Everything's sorted now. We all want to play in the semifinal and sometimes stuff happens."