Both Chelsea and Atletico Madrid are believed to be starting a bidding war against one another in hopes of landing Jose Callejon from Napoli, Express reports.
The Spanish side will want to add some reinforcements to their squad after seeing the Blues take back on-loan goalkeeper Thibaut Courtois as well as recently signing star striker Diego Costa.
In addition, they are also in the process of negotiating a deal worth around £20million for Filipe Luis, as they look to finalize their raid of the La Liga champions.
Diego Simone is prepared to rival Jose Mourinho in luring the 27-year-old forward to Spain, with the player valued by his club at around £16million.
Callejon netted 15 goals in 37 starts for the Serie A side and has now made himself a potential target for a host of European teams.
Mourinho will need to add some extra attackers after seeing Demba Ba leave for Besiktas and a highly possible loan move out for Romelu Lukaku imminent.