Andreas Christensen is set to join Barcelona in the summer.
The big Dane have agreed personal terms with the Catalan giants and will join as a free agent this summer.
Even Barca president Joan Laporta has confirmed the transfer in an interview last month,
Tuchel was asked on why Christensen decided to move to Camp Nou.
Tuchel said: “You can’t take these things personally. If he decides to continue his career somewhere else, we will understand it even if we do not agree.
“No concerns. Maybe it is a bit more challenging for him than normal in a moment where everything is clear.
“But maybe he cleared his future. I don’t know it yet, but for me it is very clear when I had conversations with him last summer and through winter.
“The bottom line was that as long as he is my player, I will not expect anything less than 100 per cent commitment. This is what I demand for him.
“That he was out Saturday was nothing personal, just a tactical choice. He is our player and we want to have the most of him. He needs to be focused. This is his job and it’s what we expect.”