Ian Maatsen is delighted with his progress with Borussia Dortmund.
The fullback joined on a straight loan from Chelsea in January to the end of the season.
He recalled to the club's website: "Of course I felt it was an honour that a big club was looking for me. I played throughout the year in Chelsea and I was always part of the squad when the request came from Dortmund.
"I would have liked to have flown to the training camp in Marbella, but things got complicated and as a player you can't do more than wait."
Maatsen continued: Then suddenly everything happened very quickly. The agreement between Chelsea and BVB, the flight to Germany and the first game the next day. And what can I say: it went quite well."
Chelsea are expected to demand 30m from Dortmund to make the deal permanent.