Brown dislocated a thumb in the opening round of the Heineken Cup against Newport Gwent Dragons on October 9th whilst Narraway has been sidelined since preseason following surgery on a bulging disc in his back.
Brown comes into the second row in place of Will James who unfortunately damaged medial knee ligaments last weekend at the Stoop whilst Narraway is named amongst the replacements.
Also in the starting line up compared to the side that started at Harlequins last weekend are Eliota Fuimaono-Sapolu, Lesley Vainikolo, Nicky Robinson, Rory Lawson, Scott Lawson, Alasdair Strokosch and Akapusi Qera.
Robinson is back at fly half in place of Freddie Burns who is having a minor operation on his calf to address cramping issues and will be ruled out for a couple of weeks.
Therefore, Carlos Spencer is on the bench as is Alasdair Dickinson who is back after injury.
Redpath acknowledges that the travelling Falcons will pose a real threat having won twice on their travels already so far this season.
"We have to be switched on, it's not going to be easy. Newcastle have actually played pretty well over the past few weeks in away games.
"They've beaten Bath and they've beaten Irish so they're not a bad side. We can't underestimate them and we won't. We have to be really focussed."
Gloucester Rugby:
Olly Morgan; Charlie Sharples, James Simpson-Daniel, Eliota Fuimaono-Sapolu, Lesley Vainikolo; Nicky Robinson, Rory Lawson; Nick Wood, Scott Lawson, Greg Somerville; Dave Attwood, Alex Brown; Alasdair Strokosch, Akapusi Qera, Gareth Delve (capt)
Replacements:
Darren Dawidiuk, Paul Doran-Jones, Alasdair Dickinson, Adam Eustace, Luke Narraway, Dave Lewis, Carlos Spencer, Tom Voyce
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