Homeland star Damian Lewis has joked that he can't drop the American accent he uses in Homeland.

In an interview with GQ magazine the British actor said that playing American soldier-turned-terrorist Nicholas Brody has affected his real-life speech pattern.

"At this point, I don't know what accent will come out when I order coffee in the morning," Lewis joked.

Lewis added that the brooding he's noted for while playing Brody often makes him appear more intense than he is in reality.

"I know it looks like I'm thinking deep thoughts on the show, but I'm probably just trying to remember my next line," he joked.

Lewis added: "[Brody is] a lot of fun to play because he behaves badly in extremis."

The actor recently signed a new five-year deal to play Brody which guarantees a total of seven seasons of Homeland.

Homeland airs tonight (Tuesday) on RTÉ Two.