“Chelsea is a top club and the competition is very high.
"Every moment we need to get results, we need to perform. That has been the case for a long time at Chelsea and will be the same now.
"Obviously I am very happy that Chelsea have signed Pulisic. He is a talented young player and will come in the summer.
"For the next six months he will be with Borussia, but I'm happy that we are getting young players. Hopefully he can be very good for us."
Christian Pulisic will link up with Chelsea ahead of next season (Image: GETTY)
Chelsea beat the likes of Liverpool and Manchester United to the United States international, who has 10 goals and 13 assists in his 81 Bundesliga games.
And the attacker is delighted to be making the move to Stamford Bridge.
Pulisic told Chelsea’s website: “In summer I move on to Chelsea and to a new competition, the English Premier League.
“It’s a privilege to have signed for such a legendary club and I look forward to working hard towards being a contributor to their team of world-class players.”
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Cesar Azpilicueta is looking forward to playing with Christian Pulisic (Image: REUTERS)
Chelsea director Marina Granovskaia added: “We are delighted to have signed one of Europe’s most sought-after young players.
“Christian has shown his quality during a fantastic spell in Germany and at just 20, we believe he has the potential to become an important Chelsea player for many years to come.
“We look forward to welcoming him to Stamford Bridge in the summer and wish him and Dortmund every success for the remainder of the season.”