And Keown believes Moses’s absence was a big blow for Antonio Conte’s men who squandered a 2-0 lead to settle for a draw.
“I have plenty of admiration for Conte as having played in that system [3-4-3 formation] myself, I never thought it could work,” Keown told DailyMail.
“But against City and Roma the back three became a five. Chelsea were so effective last season because their wing backs stayed high to affect the game.
“Now, they are just defenders. They really missed Victor Moses [on Wednesday night].
“Chelsea showed character to draw level. But they were given a good examination by Roma.”
Moses who has played six league games for the reigning English Premier League champions this campaign is expected to be out for four weeks.