The Blues meet Leicester again on Tuesday with a top four finish still in play.
"This is a strong group," insisted Tuchel.
"There is no reason to doubt these players, who have done so well to get into the top four from 10th place, to reach the FA Cup final and to be in the final of the Champions League.
"We are strong enough to handles these situations and these are the challenges that we face. It's not easy, but it is fun, and there are a lot of teams chasing us and our situation."