Lyon won 1-0 the first-leg of their Champions League round 16 tie via a Louis Tousart goal.
Afterwards, Sarri lamented: "I have many difficulties in passing the concept of moving the ball quickly to this team.
"In training the ball travels at two hundred miles an hour, the strange thing is that in the game it doesn't happen.
"When you lose speed everything becomes more difficult. The strange thing is that in training we work at double speed compared to what we did tonight."
He also said, "In the first half it was worse. In the first half we approached the game slowly, with little aggression, poor."
And the coach added: "The way we pass the ball is one thing, the relationships is the other. There is nothing wrong between me and the players, but they're struggling to pass the ball quickly."