The Blues midfielder starred for the first team under Lampard, was infamously benched for Tuchel's first game, but has since become a key cog in the German's side.
He said: "The week was a kind of whirlwind, it was crazy. It's something I've never experienced before so you're just trying to work out - what's the next step? What's happening next? How's the next day going to look?
"We had a meeting where he put down everything he wants us to do, how he wants us to play, how he likes to manage. He told us everything and then we went out and trained and we had a game the next day.
"So it was a crazy kind of turnaround but he was so clear on what he wanted and how he would like us to play, very clear on the roles and responsibilities, that it made it very easy for us to transition."
The 23-year-old also revealed just how quickly he and his team-mates picked up Tuchel's demands and playing style.
He added: "From day one, as players we realised how he gives his game plan. It made it easy for us to go onto the pitch and do it. As a team we are players who react off that and adapt very quickly. It made it easy.
"It makes it very clear what you as an individual needs to do. That's definitely something that's impressed me a lot, with the backroom staff as well. They've all been brilliant since they came in and it's really been working well."
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