The former Borussia Dortmund winger could retain the only shirt number he has ever worn during his club career.

The England Under-21 international has moved to Stamford Bridge on a seven-year contract. Here is what he will offer Maresca's

Chelsea have signed Jamie Gittens from Borussia Dortmund on a contract until 2032, the Premier League club said on Saturday. "It feels great," Gittens said. "It's a great feeling to join such a big club as Chelsea. "I can't wait to learn from everyone in the team and to push myself to the max here. It's an amazing feeling."