Not two-goal hero Angel di Maria or summer signing Keylor Navas, who had just shut out his old team to help his new one make a perfect start to their Champions League campaign.
Tuchel congratulated both of them, of course, along with the rest of his stars, but it was Idrissa Gueye, another recent arrival, who got more than just a handshake.
The German embraces his £30m summer signing after watching him dominate Real's midfield
Tuchel sought out the midfielder and stopped him for a brief chat, holding the former Everton man's head in his hands before giving him a kiss on the cheek.
Then he embraced Gueye, thanking him for the kind of midfield display which can often go under the radar, but is so important when attempting to stop a side with the attacking quality of Real Madrid.
The Senegal star was everywhere that night, shackling Toni Kroos and getting back to thwart Eden Hazard, Gareth Bale and Karim Benzema on a miserable return to France for Zinedine Zidane.
Not known for his forays forward, he even got an assist after some excellent work down PSG's right and a perfect pass into Di Maria's path for his second of the night.
Gueye's £30million move from Goodison Park attracted little fanfare over the summer, which is understandable when you consider the Galactico-type signings the French champions have made in recent years.
Neymar and Kylian Mbappe arrived as the two most expensive players in the history of the game, while Edinson Cavani and Di Maria cost around £100m combined.
Gueye has been in superb form for PSG since making the move to Ligue 1 from Everton in July
The midfielder challenges Angers' Vincent Manceau during PSG's 4-0 victory last weekend
Gueye, on the other hand, was brought in from a club who finished eighth last term for a relatively modest fee. He was closing in on his 30th birthday and the nature of his position - he is a ball-winning midfielder - is not one which often excites the average football fan.
He has proved, however, that none of that matters if you're excellent at what you do - and you fit the manager's system.
The game against Real Madrid was his first in the Champions League in almost seven years, but he immediately looked