Parker has been out of action since breaking a thumb in Wales' Six Nations loss to Ireland in February.
Friday's referee is our old friend from Montpellier Simon McDowell (Ire).
Celtic Warriors
15 MORGAN Kevin
14 JAMES Dafydd
13 PARKER Sonny
12 THOMAS Gareth (c)
11 WYATT Gareth
10 SWEENEY Ceri
9 COOPER Gareth
1 JENKINS Gethin
2 DAVIES Mefin
3 HORSMAN Chris
4 COCKBAIN Brent
5 SIDOLI Robert
6 PARKS Richard
7 HARRIS Cory
8 BRYAN Richard
Subs
16 REES Matthew
17 JONES Martin
18 JONES Deiniol
19 JONES Ryan
20 MARTENS Sililo
21 JENKINS Neil
22 HAVILI Aisea