The 20-year-old was pictured at Stamford Bridge wearing the club's new home shirt for the first time since agreeing a £58 million transfer in January.
"It feels amazing and I'm super excited to get started with Chelsea," Pulisic told the club's official website last week.
"It's going to be an amazing experience, one I can't wait for, and to be here in England, speaking English again and meeting all the guys is something I'm thrilled for.
"I've been waiting a long time for this and playing in the Premier League has been one of my biggest dreams. To be a Chelsea player is a huge honour and something I'm really excited for."
Stay tuned... pic.twitter.com/SNkhKcppWb
— Chelsea FC (@ChelseaFC) May 21, 2019