England manager Roy Hodgson is facing fresh concerns ahead of Euro 2012 after central defenders Gary Cahill and John Terry suffered injuries in the 1-0 friendly win against Belgium.

Cahill underwent a scan at Wembley amid fears he fractured his jaw in a collision with Joe Hart.

And Chelsea team-mate Terry will have a scan on a hamstring injury on Sunday.

"If Cahill has fractured his jaw, which is a distinct possibility, we lose another one," Hodgson said.

"He is a key element of our group.

"It concerns me, England's 4-4-2 with a rigid formation. We have to have more flexibility."

"If it is a case of bad bruising it won't stop him from going with us to Poland and it won't stop him from playing."

Captain Steven Gerrard was also replaced but the Liverpool midfielder only had cramp.

"It's not a worry," said Gerrard. "It was a really tough game out there. It wasn't a full game but it was the first nearly full game I've played since the cup final.

"So I'll be fine for our first game against France on 11 June, no worries."

Cahill was injured when he was pushed by Belgian forward Dries Mertens into the onrushing Hart and the Football Association have announced there will be no update on his condition until Sunday.

Hodgson criticised Mertens' challenge, saying: "I wasn't too happy about it.

"It is always unfortunate when an attacker is chasing a defender screening the ball to the keeper and these pushes and nudges take the defender into the keeper.

"It is something defenders take very, very unkindly to."

Terry is also a worry after leaving the field in the second half, leaving Phil Jagielka and Joleon Lesott - who also picked up a head injury - in defence.

Hodgson said: "There is a slight worry with John Terry. He has worked quite hard this week and he felt a tightening of his hamstring.

"This doesn't necessarily mean anything other than fatigue but he will also have a scan on Sunday."

Hodgson has already lost John Ruddy, Gareth Barry and Frank Lampard from his original 23-man squad thanks to injury - but he refused to be drawn on who would be drafted in if Cahill or Terry, or both, are ruled out.

Manchester United's Rio Ferdinand was a contentious exclusion from Hodgson's squad, but the manager said: "I don't want to get involved in 'if this happens what will you do?' I will deal with it when the time comes."