DERBY County have signed German midfielder Tom Koblenz.
The 19-year-old has been on trial with the Rams and featured for the club's under-21 side.
The former Hoffenheim youngster has penned a two-year deal with Derby.
“I am pleased that Tom Koblenz sees his future at Derby County and I would like to welcome him to the club," said Rams head coach Steve McClaren.
“We are building for the future and Tom is another young player who will benefit hugely from working with the under-21 development squad, alongside a number of exciting young prospects.”