Steaua Bucharest defender Vlad Chiriches' agent claims his client is drawing admiring glances from Chelsea, reports Sky Sports.
The 22-year-old Romanian international was said to be a target for Barcelona, before seeing out the summer in his homeland, but is once again the subject of more speculation, ahead of the January transfer window.
Blues boss Roberto Di Matteo is among those managers to have expressed an early interest in Chiriches, but the Champions League holders would face competition for his signature from Italy, should they attempt to lure him to Stamford Bridge.
"I can confirm that AC Milan are looking at the player," the defender's representative Viktor Becali told calciomercato.com.
"Milan's sporting director (Ariedo) Braida has seen him play several times both for the national team and for his club team.
"There is nothing concrete yet, though, and it is too early to say what will happen."
Chelsea are well stocked at the back with club captain John Terry, Gary Cahill, David Luiz and Branislav Ivanovic able to operate at centre-half, though the collective defence has been criticised at times this season for its shaky disposition, which is in stark contrast to Di Matteo's lethal attack.
The Italian tactician might prioritise strengthening his defensive options with Chiriches in January, having splashed more than £70million on forward-thinking players during the summer.
"I don't know if he could leave in January, it will depend on the offers which may arrive when the market opens," Becali added.
"There are many clubs interested in Chiriches - Chelsea, Inter Milan and Zenit [St Petersburg] - but there is nothing concrete in place as yet."