The Brazil international was firmly in the spotlight during the summer as he led the Selecao in their home World Cup, and was accused of showing weakness as captain when he sat apart and struggled to contain his emotions during the penalty shootout win over Colombia in the quarter-finals.
While ex-Chelsea centre-back Lebouef claims both players have significant influence within the PSG set-up, he believes that the Swedish striker offers more leadership on the field than his Brazilian counterpart - a defender he claims has an attitude problem.
"The real captain of PSG is Ibra," he is quoted as saying by Le10Sport.
"Put Ibra in Brazil's context during the World Cup, he'd keep a cool head. Sometimes attackers are less about the collective, but Ibrahimovic gives guidance to his team-mates.
"Thiago Silva? He would never have been captain of PSG. Even if, as a centre-back, he has the game in front of him and that's an advantage.
"Silva has an an attitude problem. You sense he's not invested, sometimes in a panic.
"Ibra and Silva have a real influence when they ask the club for something. They give them what they want."