Chelsea have made it clear to one top European club that they are only going to do business on their terms. The Blues do seem open to selling a host of their players this summer. For example, the likes of Ian Maatsen and Conor Gallagher could both leave Stamford Bridge during this transfer window. Maatsen is closing in on a move to Aston Villa, while Gallagher is said to be attracting interest from other Premier League clubs as his contract continues to run down. The midfielder has entered the final year of his existing deal. Chelsea make stance clear to clubMost teams outside of England do no…