© AMC
Draper (Hamm) and Harris's (Christina Hendricks) past will be referenced in the upcoming season and Hamm joked that the pair may already have had a sexual relationship.
When asked why the womanising Draper has never had a romantic relationship with Hendrick's character, Hamm laughed: "Who says he hasn't?
"The Don/Joan dynamic is something that we do explore, and don't take this the wrong way, but we do explore as the show goes on. They have worked together for a long time, they know one another very well and I'll leave it at that."
© AMC
He also spoke about the possible future between Don and Megan Calvet (Jessica Paré), arguing that the death of Ann Draper (Melinda Page Hamilton) may have caused a change in the character's love life.
"[Anna's death] may have caused some tectonic shift in Don and it may be one of the reasons we saw the proposal. It's not a mistake that he gives Megan Anna's ring, he did not give that to Betty, but I think that there is hope," he said.
Hamm was speaking at a BAFTA Q&A event at the Curzon Mayfair.
Season five of Mad Men starts on AMC on March 25. It premieres in the UK on Sky Atlantic on March 27.
> Mad Men season five to debut in UK two days after US
> Mad Men exec: New season is about change
