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It was Thomas Tuchel who handed Christian Pulisic his debut as a teenager at Borussia Dortmund, and the American has grown into one of the finest young players in the game at the moment.
Chelsea paid over £50m to sign the man famed as Captain America, and he has grown in strength since then.
Pulisic has now hailed the impact of Tuchel in his career and the trust he gave to him as a youngster.
“I remember making my debut under him and it was a really exciting time,” Pulisic told the official Chelsea website.
“I was playing in the youth team at Dortmund and then I got the call to say I was going to go up and train with the first team, and be a full first team member. It was really exciting.
“I had to fight my way into that team because it was a very strong team, and being a young player I had to work extra hard.
“The manager trusted in me and most importantly gave me chances to play, so I am grateful for that. He definitely helped me as a young player and I only have good memories of that time. We had some success at Dortmund together, and it’s been good to see him again and work with him once more.”