The Arsenal midfielder was left crumpled in a heap on the Wembley turf following a tough tackle from Daniel Agger that required treatment and briefly stopped play.
|7/4||Arsenal are 7/4 with Bet365 to be ahead at half-time and full-time against Everton|
"I'm fine," he insisted to Sky Sports. "It's a bit sore but it's only a bruise.
"I've had a scan already and it showed just a bruise so I'll be alright."
England were far from their best at Wembley - with Daniel Sturridge's goal proving decisive - but Wilshere believes that there are positives to take from a below-par performance as the World Cup edges ever closer.
He added: "We kept going and got the goal in the end.
"When it comes to the World Cup, those crucial goals at the end are going to make a big difference."