Giroud’s overhead kick goal in the 68th minute was the difference between Chelsea and Atletico Madrid in the first leg of the Uefa Champions League second round tie.
Tuchel has also hailed the veteran striker for his professionalism .
“He trains like a 20-year-old,” Tuchel added. “He is a guy who has a good mixture of serious and joy in training.
“He is always positive and it is a big factor for the group.
Giroud has scored 11 goals in all competitions for Chelsea this season including scoring all four goals against Sevilla in the group stage.
The second leg is set to take place on Wednesday, March 17 at Stamford Bridge.