The Blues have been linked with the trio since the summer. The club are currently appealing an 18-month transfer ban.
Arnesen told Portuguese newspaper O Jogo: “These are good players and we need to know details about this type of footballer.
“This does not signify that Chelsea are preparing contracts but it is necessary to follow the market.
“The club awaits a decision over transfers and when we will be able to next reinforce the squad.”
