Aston Villa have made enquiries about Chelsea defender Ian Maatsen.
Maatsen has a £35 million release clause in his contract.
Borussia Dortmund wants to sign him following his successful loan spell in the second half of last season.
However, they want to negotiate the release clause. Chelsea is refusing to budge.
Chelsea and Aston Villa have been in talks about signing numerous players.
Chelsea is still interested in signing their teenage striker Jhon Duran.
Villa, meanwhile, are interested in Conor Gallagher.
