Arsenal defender Shkodran Mustafi says Per Mertesacker has been key in him settling so quickly.
Mustafi joined the Gunners from Valencia last summer for £35million and has largely impressed in the middle of Arsene Wenger's defence.
"Per helped me a lot," said Mustafi, who was back in training on Wednesday preparing for the visit of Burnley on Sunday afternoon in the Premier League.
"When I had just arrived, having a person at the club with so much experience and with the personality he has helped me a lot.
"He helps me on the pitch because when he sees things, he corrected me a few times. He's not just the type of player who says, 'You didn't do that well enough' or, 'You have to do it this way', he tells you why.
"In the short time that I worked with him in the national team, I learned a lot from him."