England's injury crisis ahead of Euro 2012 deepened last night after Cahill was forced off after less than 20 minutes while fellow central defender John Terry also suffered a hamstring strain.
Reserve goalkeeper John Ruddy (broken finger), Frank Lampard (thigh) and Gareth Barry (abdomen) have already been ruled out.
Cahill's hopes were boosted this morning after Football Association director of football development Sir Trevor Brooking hinted an initial scan last night had cleared him of major damage.
Trevor Brooking: "Gary was certainly our initial main concern last night.
"He had a scan last night. At the moment the feedback is that we are hoping it is not cracked.
"It was his jaw following the collision and they were concerned that it was cracked and it might have put him out of it (Euro 2012).
"At the moment we're hoping it's not. I'm sure they'll have a second look but at present we're hoping that's okay.
"John Terry had a hamstring issue that will be scanned this morning. The medical staff are hopeful that it is not bad enough for him not to be able to stay in the squad.
"We had one or two other injuries, obviously Danny Welbeck played having had an ankle knock.
"That seemed okay although I'm sure he'll have got some reaction from playing for the best part of an hour.
"Glen Johnson's got a toe injury. He played yesterday, it was a little bit sore towards the end but he should be fine as well and Scott Parker, of course, is still working towards that match fitness.
"There's a combination of different issues which will keep the medical team busy.
"At the moment we're still hoping that the 23 will stay intact."
Danny Welbeck scored the only goal to ensure England head to Euro 2012 on the back of victory over Belgium at Wembley.
Welbeck raced onto Ashley Young's precise through-ball before dinking smartly over Simon Mignolet on 36 minutes to give England a lead they seldom looked likely to surrender.
Guillaume Gillet shaved the upright with a long-range strike and seemingly Tottenham-bound Jan Vertonghen headed over as Belgium searched for an equaliser, while substitute Jermain Defoe almost added a second for England as he struck the post after beating Mignolet.
The result means England head to the European Championships with back-to-back 1-0 victories under new boss Roy Hodgson.