The 22-year-old was expected to leave Chelsea on loan.
But after impressive performances over preseason, including the Super Cup final win over Villarreal, the tall defender is forcing Tuchel into a tough decision.
"Absolutely that's why he played. He played good against Arsenal and he played a good game also against Bournemouth, then Arsenal, then Tottenham. We wanted to have guys on the fireld who are capable to play 90 minutes.
"Trevoh was first in training the very first in training and is physically strong and deserved to play by his performances so far and again today he was very strong.
"He suffered in some moments but later with Azpi by his side and Jorgi close to him and helping him in tactical organisation he stepped again up.
"He never lost face and stayed calm and was physical enough to play 120 minutes. It was quite impressive. He forced his way into our thinking. Let's see how it goes.
"We still have some days to decide his personal future but in the moment he shows his value to the team."