The uncapped Sale Sharks scrum-half was drafted into the world champions' training squad as emergency cover earlier this month following an injury to Peter Richards.
The London Irish scrum-half has been troubled by back spasms and has been unable to take part in any of England's three warm-up matches. The England players are now on a 10-day break before they jet out to France on Sept 3, and coach Brian Ashton will make a decision in that period on whether Wigglesworth becomes a permanent replacement.
Wigglesworth, 24, was England Saxons' first-choice No9 in this year's Churchill Cup.
A product of Sale's Academy, who can also play on the wing or at fly-half, Wigglesworth impressed during the Sharks' Premiership final win over Leicester at Twickenham 18 months ago. Having served a lengthy club apprenticeship behind Scotland's Bryan Redpath and Tonga's Sililo Martens, two vastly experienced No9s, he would be a handy replacement should Richards be ruled out.
Meanwhile, Chris Ashton is free to begin his rugby union career with Northampton after being released by rugby league giants Wigan.
The 20-year-old signed a three-year contract with the Saints back in March and was set to link up with them when his Warriors deal expired in November.
That would have seen him miss the start of the rugby union season but he will now be available for the big kick-off when Saints begin their bid to get back into the Guinness Premiership following last term's relegation.
Wigan chairman Maurice Lindsay said: "Chris was anxious to commence his rugby union career with Northampton. It is pointless having a player in the squad whose mind is elsewhere."
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