Tuchel believes his side face one of the biggest challenges in football by trying to overcome a resurgent United in the last 16 of the Champions League.
“I don't think there's any surprise about Paul Pogba being a key player," said the German. “He's an incredible player, wonderful qualities. He can do a lot of things - extremely strong with the ball at his feet, he's very good and very strong in challenges and one-on-ones.
“Taking people on, he's always capable of making a difference and I think in my opinion he's always dangerous offensively with (Anthony) Martial. They're a very dangerous pairing.
“Pogba is dangerous in the penalty area as well when the ball comes in from the right and he arrives at the right time, he's a very good header of the ball. He's a key player absolutely and he's now becoming a leader.
“He loves playing for this club."