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Chelsea boss Frank Lampard made just one change from the Champions League victory over Ajax in midweek, with Pulisic coming in for Callum Hudson-Odoi against Burnley.
Captain America responded by scoring his first career hat-trick to help Chelsea beat Burnley 4-2.
Asked if he was delighted with the performance of Pulisic against Burnley, Lampard said: “I’m absolutely delighted for him.
“A lot of talk around Christian for the big price tag, the fact he’s quite rightly a star in his country and plays for the US so well and captain of, so you get asked questions about it.
“I’m delighted to see him do that today. I know the backstory and the pressures of a move like that. I also know he played for his country through the summer and had one week break this summer to come back after that.
“Then you get the pressure of can you settle in the Premier League, so I’ve tried to deal with it in the way I see best which is to give him minutes.
“He’s played games this season already, but I’ve also got competition in that area. I need them all on edge, I need them all trying to perform when they get in the team and play.
“Christian has been doing it recently, he’s been doing it from the bench. He fully deserved his start today and it was a fantastic match-winning performance.”