Cahill suffered the injury after colliding heavily with Joe Hart following a challenge from Belgium’s Dries Mertens during England’s 1-0 friendly victory at Wembley on Saturday.
The Chelsea centre-half is the latest name added to a growing injury list in the build-up to the tournament in Poland and Ukraine, with goalkeeper John Ruddy and midfielders Gareth Barry and Frank Lampard already ruled out after being included in Roy Hodgson’s original 23-man squad.
Lescott wrote on Twitter: “Gutted to hear Gaz [Cahill] is ruled out. The challenge that caused it was more reckless and dangerous than most two-footed tackles so why only yellow?”
PSV Eindhoven winger Mertens has since apologised for the push that forced Cahill into Hart at Wembley. He said: “Absolutely, I feel for him.
“If that was me in his place, getting injured like that a week before the Euros, I’d feel so bad. I’d feel terrible. I’m sorry he’s not able to go.”
Liverpool defender Martin Kelly, who has just one England cap, has been drafted in as Cahill’s replacement as Hodgson controversially chose not to call on the more experienced Rio Ferdinand.
ENHANCED ODDS: Get 10/1 on Arsenal to beat Chelsea