Tuchel moves to Stamford Bridge following a two-and-a-half year spell at French champions PSG, which came to an end last month. He will be the first German to manage Chelsea and arrives having guided PSG
"I thought Billy was outstanding. The way he played today and how he trains, I see him growing with us. He's going to be a Chelsea player so it's just about making sure the pathway is right for him," the club's official website quoted Lampard as saying.