Bayer Leverkusen goalkeeper Ramazan Ozcan is retiring from international football with Austria due to personal reasons.
Liverpool manager Jurgen Klopp says captain Jordan Henderson will miss the club's next game and is unavailable for England selection this month.
Southgate and the Football Association are determined to use the Confederations Cup as a valuable fact-finding mission ahead of Russia 2018.
"Time will tell, but I'm confident Axel will maintain his thirst for victory to remain an important player for Belgium," Martinez said.
"I get the impression Deschamps is maintaining the uncertainty, and that annoys me," Dugarry said.
Northern Ireland manager Michael O'Neill talked football with the Queen as he was appointed an MBE at Buckingham Palace.