The 24 year, who recently signed a new contract with Gloucester, will join up with club mates Freddie Burns and Elliott Stooke as the Saxons prepare for the game at their training base at Loughborough University.
Meanwhile, Gloucester Rugby team mate, Dan Robson, is also training with the Saxons squad as injury cover.
Joe Lydon told PA today that he's confident that Sharples will come in and do a fine job.
"We know Charlie well, we know what he can do. He'll do a great job for us, he's a quality finisher, he's on form and he comes in with the history and experience, but also in current form and playing at home.
"I think he knows what he needs to do [to get back into the EPS]. We can give him the opportunity, but he knows the rest of what he has to do.
"Stuart has proved that if people are playing well they have a chance. Charlie's been great with us, he understands the situation perfectly."
Tickets are still available for the England Saxons vs Irish O2 Wolfhounds at Kingsholm Stadium on Saturday evening (Kick off 5pm). Tickets start at just £8 for adults and it's Kids for a Quid!
You can purchase tickets by visiting www.gloucesterrugby.co.uk/tickets.