Greys Anatomy is digging into Dr. Andrew DeLucas backstory -- and that means meeting one of his immediate family members.

Giacomo Gianniotti revealed that in the 14th season of ABCs hit medical drama, viewers will be introduced to DeLucas sister, who will be walking the halls of Grey Sloan Memorial Hospital.

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We are bringing my sister [in] as a new character. She is going to be a new presence at the hospital. She comes from Italy, as my character is Italian, and you get to see us exchanging some blows in Italian, which will be very interesting,Gianniotti told ET, who has played DeLuca since season 11, at the Disney/ABC cocktail party at the Beverly Hilton Hotel on Sunday.

Gianniotti wouldnt divulge DeLucas sisters medical expertise or the reason driving her to settle in Seattle, Washington, but offered this telling nugget.

Her profession, although we cant disclose it, is a very interesting one, he hinted. Its going to keep a lot of the doctors on their toes, make some doctors uncomfortable [and] some people will be glad about [her coming on]. Shell stir things up with a European background and take on medicine.

The 28-year-old actor, who was born in Rome, expressed excitement over the opportunity to dust off his Italian for the small screen: Its great!

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Gianniotti revealed that the part is already cast and played coy about the actress who plays her. I cant wait for you guys to meet her. Shes lovely. Shes going to be a great new addition to the show, he said, staying mum on when viewers will first meet her, though its expected to be a multi-episode arc.

But despite the secrecy, Gianniotti promised that the new season will see more of DeLucas layers being peeled back.

This season, were definitely going to get to know DeLuca a lot better. The writers have told me that theyre fleshing him out a lot, he assured.

Greys Anatomy kicks off season 14 with a two-hour premiere Thursday, Sept. 28 at 8 p.m. ET/PT on ABC.

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EXCLUSIVE: 'Grey's Anatomy' to Introduce DeLuca's Sister in ... - Entertainment Tonight