Although Gilmour is ineligible to feature against Chelsea, Tuchel spoke about what he feels the midfielder needs to do in order to nail down a place in Norwich's starting line-up and return to the Blues with a successful loan spell under his belt at the end of the season.
"I love Billy and I always loved him," said Tuchel. "He was a big factor, maybe not in the spotlight, last season when we came in for the last half. He decided to go, to have a bigger chance to catch some minutes, and we thought it was important.
"First of all I want him to perform. It's more or less the same question about how you make it into our teams – by pure performance. If you decide to go on loan it's as simple as that and I don't mean it harsh. You need to perform, you need to be on the pitch, you need to be the top player no matter where you go if you want to make it back here and you want to improve yourself.
"He's our player, we love Billy, we're very aware of what he can do, but changing a club is always a risk and is always a huge step and it can also be positive. He needs to overcome adversity and now is not the time to speak about coming back, it's time to fight for his place and show what he can do.
"We trust him that he can play a role. Of course no-one is obliged to let our players play, but no coach in the world will leave the best players out. So that's what he needs to prove, that Norwich is a better team with him. I trust that he can do it and hopefully he does not lose this trust in himself and can turn things around again."
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