Also included is Day's new teammate at the Rec, Rhys Priestland - one of three fly-halves alongside Dan Biggar and Bristol youngster Matthew Morgan.
Northampton Saints winger George North, who won his 50th Welsh cap on Saturday, takes his place in the squad alongside Harlequins-bound centre - and fellow British & Irish Lion - Jamie Roberts.
Exeter Chiefs prop Tomas Francis makes the cut after impressing Gatland during the Welsh training camps and links up with former Bath man Paul James in the front row.
There is, however, no place for Gloucester Rugby back rower Ross Moriarty, who made his Test debut this month.
Wales kick off their World Cup campaign against Uruguay in Cardiff on September 20 but things will soon get tougher, with Fiji, England and Australia also in Pool A.
Wales squad

Follow Bath Rugby Inside Out on twitter @BathRugbyINOUT
Check of the Facebook page here
151231meiqing
ReplyDeletemichael kors outlet
coach outlet
adidas originals
ugg boots on sale
celine handbags
abercrombie
burberry outlet
canada goose outlet
cheap uggs
coach outlet
louis vuitton outlet stores
jordan shoes
jordan concords
tods outlet
kate spade handbags
louis vuitton
coach outlet
michael kors outlet online
beats headphones
tory burch outlet
coach factory outlet
nike air max
hollister clothing
christian louboutin
polo ralph lauren outlet
ugg outlet
michael kors outlet stores
uggs outlet
canada goose jackets
cheap jerseys
michael kors handbags
kobe bryant shoes
the north face outlet
true religion jeans
instyler curling iron
vans shoes
ray ban outlet
kate spade
christian louboutin outlet
hollister
linyuan0315
ReplyDeletecartier sunglasses
louis vuitton sunglasses
dior sunglasses
police sunglasses
gucci sunglasses
cazal sunglasses
chrome hearts
burberry sunglasses
chrome hearts outlet
cartier watches
prada sunglasses
cartier outlet
versace sunglasses
chanel sunglasses
longchamp pliage
ReplyDeletetoms shoes
uggs on sale
cartier outlet
ray ban sunglasses
omega watches
uggs clearance
nike mercurial
louis vuitton
montblanc pens
chanyuan10.05
nike air huarache
ReplyDeletetimberland boots
michael kors outlet
lebron shoes
fitflops sale clearance
nike air max 2017
reebok outlet
pandora jewelry
michael kors outlet
michael kors outlet online
yeezy boost 350
ReplyDeleteadidas tubular
michael kors handbags
kobe 11
retro jordans
nike air force
curry 3
cheap jordans
yeezys
adidas ultra boost