Luke Charteris has also been declared fit following bruising to the shoulder last weekend at Glasgow.
"I'm delighted to have Ashley, Wayne and Ben back in the side this weekend," said Dragons Head Coach Paul Turner. "We've missed Wayne over the Christmas period and I'd like to say a big thank you to Danny Lee who literally came from the surgical bed to postpone his shoulder operation and play for us all over Christmas. It wasn't easy, and he played well despite carrying the injury."
"I'm also very pleased for Ben to be back in the side. It's been a frustrating time for everyone, particularly for Ben and having had a long, hard road to recovery, this is his opportunity to have a major impact as we head into the back leg of the season."
Dragons Squad for Gloucester
Jason Tovey, Martyn Thomas Aled Brew, Rhodri Gomer Davies, Ashley Smith, Tom Riley, Richard Fussell, Matthew Watkins, James Arlidge, James Leadbeater, Wayne Evans.
Hugh Gustafson, Ben Castle, Ali McKenzie, Tom Willis (c) Steve Jones, Gethin Robinson, Rob Sidoli, Luke Charteris, Hoani MacDonald, Adam Jones, Danny Lydiate, Lewis Evans, Gavin Thomas, James Harris