Arsenal defender Calum Chambers has credited Per Mertesacker for helping him develop as a professional.

Chambers will be apart of the England side that faces Germany in the U21 European Championship semi-final on Tuesday.

"The one player who has helped me a lot would be Per Mertesacker. Being in the same position, he was almost like my mentor for a couple of years," said Chambers via the Express.

"I have never seen a player so professional, dedicated. For him mentally, every little thing he could do he did.

"That's rubbed off on me, there were times when he would be looking at me and saying 'you could do this' and that's rubbed off.

"That's helped me realise the little things you do, the tiny little one or two per cents, get you where you want to be."