Derby County could strengthen their defence by going for Gary Cahill, who is set to leave on loan.
Aston Villa swept aside Derby County on Saturday, sealing a 3-0 Championship win at Pride Park.
It is still early days for Dean Smith at Aston Villa but his side's 3-0 win at Derby on Saturday showed significant progress.
Derby County and Aston Villa are said to be interested in Chelsea's 18-year-old defender who is already a full Wales international.
Derby County need to bolster their wide options this January.
Aston Villa ran out 3-0 winners against Derby County at Pride Park on Saturday.
Derby County manager Frank Lampard says that Jack Grealish was right to ignore reported interest from Tottenham Hotspur and sign a new contract with Aston Villa.
Derby County face Aston Villa at home in the Championship.
Championship duo Aston Villa and Derby County are both reportedly interested in signing Chelsea's Premier League youngster Ethan Ampadu.
Aston Villa assistant John Terry reportedly recommended Jack Marriott to Derby County manager and his former Chelsea teammate Frank Lampard.