England manager Roy Hodgson revealed both Gary Cahill and John Terry were to undergo scans following the 1-0 victory over Belgium at Wembley.
Cahill underwent a CT scan on the injury on Saturday evening, with the FA later revealing that the results will be announced on Sunday.
Hodgson is crossing his fingers that the results are positive, though there are concerns that the player could miss Euro 2012 if it's revealed his jaw is broken.
However, his initial worry after Cahill was shoved into goalkeeper Joe Hart by Dries Mertens during the early stages of Saturday's 1-0 win over Belgium at Wembley was that the Chelsea man was in trouble.
"I wasn't too happy about it (the challenge). 'Unfortunate' is too kind a word," Hodgson said.
"When a striker is chasing a defender who is feeding a ball to the goalkeeper, those nudges and pushes take the defender into the goalkeeper.
"It is something if you have been a goalkeeper you take very unkindly to.
"The referee gave him a yellow card, which he deserved. Unfortunately for us, the consequences might be a lot more than a yellow card because a fracture is a distinct possibility."
That would immediately rule Cahill out of Euro 2012, along with Gareth Barry and Frank Lampard, who have already fallen foul of the injury curse.
As Hodgson brought his standby defender, Phil Jagielka, in for Barry, it will leave him with a major dilemma about who to select as another defender.
He did bring in Liverpool's uncapped Martin Kelly to train last week when Glen Johnson was struggling with a bruised toe.
Kelly is a clear possibility. However, that would mean Phil Jones covering a central defensive position, with Joleon Lescott the potential partner for John Terry when England open their Group D campaign against France in Donetsk on June 11 - even though both prefer to play on the left-hand side of defence.
Another option would be Rio Ferdinand, although the political sensitivities of that are clearly enormous.
"It is shortly after the game and we have won," he said.
"After a good week at the Grove I don't want to get involved in discussing what I will do 'if' this happens. I will deal with it when the time comes."
In any case, Terry's fitness cannot be 100% guaranteed, even though Hodgson suspects a scan the Chelsea skipper will undergo on Sunday on a tight hamstring will prove no tournament-threatening damage.
"I suppose there is a slight worry about John Terry," Hodgson said.
"We have worked quite hard this week and players are going to feel a bit tight in their muscles and he said he felt a slight tightening in his hamstring.
"That doesn't necessarily mean anything other than fatigue. But he will also have a scan tomorrow and I will have a definite answer after that."
It is a dreadful build-up to a major tournament for England, although at least Hodgson was able to confirm neither Gerrard nor matchwinner Danny Welbeck were withdrawn for anything other than precautionary reasons.
"Steven Gerrard is cramp, which is not so surprising after the amount of work he put in, and Welbeck has been on anti-biotics for a while," Hodgson added.
"That can affect his stomach. We didn't want to take any risks."
what do you think?
I thought England were awful again very boring to watch. I don't think they will win a match at the euros As they play too defensive
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