Borussia Dortmund are one of five clubs understood to be interested in signing Crystal Palace Under-23s defender Daniel Quick.
The 19-year-old centre-back played in a pre-season friendly against Walsall under the watchful eye of Patrick Vieira last summer, but has since found his playing opportunities limited in Paddy McCarthy's under-23s.
Quick made his last league appearance for the academy side back in August and has missed out on recent matchday squads with players from Vieira's first-team dropping down to get minutes.