Speaking to reporters, ahead of the crucial match against Dortmund, Tuchel said: "Harry trained fully with the team yesterday, and has stepped things up each day. It's all fine, he'll play."
The manager further informed that Kingsley Coman and Serge Gnabry will also be included in the matchday squad.
"King [Coman] is a huge factor for us and will be back in the matchday squad," he said. "Serge Gnabry is also back. Both are hugely important for us. Our options up front are getting bigger and the competition for places should hopefully improve quality."