** Shares of British telecom firm BT Group BT.L rises 0.3% to 166.7p
** Co is in advanced talks with Warner Bros Discovery WBD.O to sell 50% of its stake in TNT Sports, Financial Times reported on May 17
** WBD has an option to buy out BT's stake before the end of 2026, the report said
** Deal could be announced as early as this week - report
** BT up ~15% YTD
(Reporting by Nithyashree R B)
((NithyashreeRB@thomsonreuters.com))