The South African second row is included in a strong Gloucester side that boasts a number of players with first team experience as they go head-to-head with one of the best A teams in the country.
Mark Cornwell will partner Davids in the second row, while Nick Wood starts at loosehead prop. Luke Narraway, who featured in Gloucester's Guinness Premiership defeat at Bath on Saturday, begins at number eight.
There is also plenty of quality in the backs with Simon Amor and Brad Davies forming the half-back combination. Marcel Garvey and James Bailey get runs on the wing, while Anthony Allen and Ryan Lamb form the centre combination.
At full-back, Olly Morgan makes a welcome return from a thigh injury and he replaces Vince Lanciano.
More than 2,500 supporters came to the last A League fixture at Kingsholm and another good crowd is expected this evening.
Tickets cost £5 for adults and £3 for juniors. Season ticket holders get in free.
GLOUCESTER (v Harlequins, Guinness A League, Kingsholm 7.30pm): Olly Morgan, Marcek Garvey, Anthony Allen, Ryan Lamb, James Bailey; Brad Davies, Simon Amor (capt); Nick Wood, Rob Elloway, Jack Forster, Quinton Davids, Mark Cornwell, Will Matthews, James Merriman, Luke Narraway.
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