Keown was back at his old club recently.
"If you look at Distin, he seems to go from strength to strength," Keown told evertontv. "He is really powerful and no-one ever seems like they are going to outrun him.
"Jagielka has improved big time since he has been at the club. The amount of blocks that he makes - he seems to get in the way of everything - is not done by accident.
"It's instinctive and he reads the game very well. He has a real chance to play for England in the next World Cup."