Thomas Tuchel joked that Thiago Silva 'ran up the stairs and was dressed like a 28-year-old' for the exuberant celebrations against Atletico Madrid.
The Brazilian was seen in the stands reacting to Emerson's late goal that confirmed Chelsea's progression to the Champions League quarter-finals, where they have been drawn against Porto.
And Tuchel said the celebrations, alongside Mason Mount and Jorginho, were typical of the veteran central defender.
The Chelsea boss said: 'I know Thiago for many years now. We had a fantastic partnership in Paris, a completely reliable captain for me from the minute I stepped in.
'Once he is part of a team, he is 100% part of the team, 100% professional. He is a very emotional guy.
'All three of them, Mason Jorgi and Thiago, were completely involved in the game and that makes them involved in the moment. I heard them during the game coaching and supporting the players. I had the same thing from Willy and Kepa on the bench.'
He continued: 'To create an atmopshere like this, you can rely on Thiago. He was so, so happy for Emerson to score like the other guys.
'He rans the stairs up and down and was dressed like a 28-year-old!'
'On his contract, it is too early. Me and the club will make this decision together but if you look at the pictures, you can see how young he looks.'