BT's chief executive, Gavin Patterson, is to step down from the company he has led for five years.
In that time Patterson has overseen the launch of BT Sport, who secured an additional package of 20 Premier League games from 2019 earlier this week.
The company said a poor reaction to its latest results, in which BT set out plans to cut 13,000 jobs, had prompted the move.
Patterson, who has spent 14 years at BT, will remain in the role until a successor is found later this year.
BT chairman, Jan du Plessis, said in a statement on Friday: "The board is fully supportive of the strategy recently set out by Gavin and his team.
"The broader reaction to our recent results announcement has, though, demonstrated to Gavin and me that there is a need for a change of leadership to deliver this strategy."
Mr Patterson became managing director of BT's consumer division in 2004. He was appointed chief executive of the BT Group in 2013.
Patterson added: "It's been an honour to lead BT since 2013 and serve as a member of the board for the last ten years.
"BT is a great business and with the new management team I've recently put in place is, I believe, very well-positioned to thrive in the future."
Patterson is the second major resignation in the Premier League rights marketplace within 24 hours, after Premier League chief Richard Scudamore announced he would be stepping down from the organisation on Thursday evening.