Morris played Reynholm Industries boss Denholm Reynholm in Graham Linehan's sitcom. When his character was killed off in the second episode of series two, Denholm was replaced by his son Douglas, played by Berry.
Asked if replacing Morris was a daunting prospect, Berry told Digital Spy: "It was daunting but you can't let that get in the way of what you want to do.
"I just did my own thing. I knew there'd be a bunch of people saying 'Who the hell is this guy, who does he think he is coming in?'. You've just got to get on with it."
Watch the introduction of Matt Berry as Douglas Reynholm below:
Show creator Linehan previously revealed plans for a fifth and final series of the sitcom, but later confirmed that a one-off special would instead end the show in 2012.
Of the future of The IT Crowd, Berry said: "Graham said it all there. Iif anyone knows then Graham will. If that's what he's saying then that's the case."
Berry also said that despite a music career and his status as the voice of Absolute Radio, he has "no interest" in regularly fronting a radio show.
Watch the video for Matt Berry & Everyone's seasonal single 'A Christmas Song' for Shelter below: