The England manager has suggested that Chilwell felt pain in his back during the game.
"He had some sort of issue with his back that he was complaining about and he didn’t feel he could carry on," Southgate told reporters after the game.
Outside of that I can’t give you any detail at the moment."
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Chilwell was subbed off after 38 minutes in a game that England eventually lost 2-0 to Belgium.
Chelsea are sweating on the fitness of Chilwell who has firmly established himself as the first-choice left-back at Stamford Bridge.
Source: Metro