Chelsea have added defender Andreas Christensen to their first-team squad after his positive spell at Borussia Monchengladbach in the last two years.
The 21-year-old will wear the Number 27 jersey during the upcoming campaign.
After his return to Stamford Bridge he made it clear that he wants to fight for a regular place in Antonio Conte's squad.
"I have come back to Chelsea a better player than the one that left two years ago," he said.
"I played about 80 games in two seasons and I have a lot more experience. I have a bit more toughness, more mental than physical.
"The physical side of things is something I still have to build on, but mentally it has given me a lot. I'm more confident, I feel ready for bigger things.
"I was up against a lot of top strikers, big teams. I remember when I played against Bayern for the first time, I was nervous beforehand because it is easy to look like a clown playing against these guys.
"Borussia played one against one at the back and I was directly up against [Robert] Lewandowski first and then [Thomas] Muller later on, but we won the game 3-1.
"Everything went well and this is the kind of thing that gives me more self-belief at the top level."
