Arsenal midfielder Wilshere was caught on the top of the foot in a challenge with Liverpool defender Daniel Agger early on at Wembley Stadium on Wednesday.
He required treatment and was clearly in discomfort, sparking fears that he could be set for an untimely spell on the sidelines as domestic competition gathers pace and the countdown to the World Cup intensifies.
Wilshere was, however, able to carry on and sought to play down the problem after making it through the best part of an hour in a 1-0 victory for the Three Lions.
He told Sky Sports: "I'm fine. 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."
On England's performance in their final friendly fixture before Roy Hodgson names his squad for Brazil, which saw Daniel Sturridge net a late winner, Wilshere added: "I think it went well. It was tough in the first half, we kept trying and they defended well. We created some chances and their keeper was really good tonight as well.
"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."
Rooney will be hoping to help provide that cutting edge in South America, but the Manchester United frontman concedes that Hodgson has some tough choices to make as he settles on an elite group which will go in search of global glory.
He said: "It's the last squad before the manager names his 23-man squad so there were 29 of us here and we all wanted to show what we can do, that goes for me to everyone else.
"We want to show the manager what we can do and I'm sure the manager has got a few things to think about now.
"It's down to the manager and he's got some tough decisions ahead of him, but that's what he's here for, to make those decisions."
Rooney also believes that his strike pairing with Liverpool hitman Sturridge is improving all the time, with England again experimenting with their attacking unit in midweek.
He added: "I am pleased for Studds tonight because it was an important goal for him and he took it really well.
"We played a different system with me, Daniel and Raheem (Sterling), more interchanging, but I thought it worked quite well with room for improvement."