St George Illawarra coach Paul McGregor has named his mandatory 21-man squad ahead of the Dragons' Round 20 clash against the Sydney Roosters at Allianz Stadium on Sunday, July 29.

Tyson Frizell (hamstring) has been named and may make his return against the Roosters, while his back row partner Tariq Sims will play his 50th game for the Dragons.

Jordan Pereira retains his place on the wing following his fantastic NRL debut against the Cowboys last weekend.

Zac Lomax (hand) has been named in the extended squad in place of Hame Sele.

The ISP Dragons (1:55pm) and Jersey Flegg Dragons (11:45am) will also play on Sunday at Allianz Stadium.

NRL squad for Round 20 v Sydney Roosters:

1. Matt Dufty – sponsored by Illawarra Mercury/St George & Sutherland Shire Leader
2. Jordan Pereira – sponsored by Relativity in the Loop
3. Euan Aitken – sponsored by University of Wollongong
4. Tim Lafai – sponsored by Kingsgrove Sports Centre
5. Jason Nightingale– sponsored by SMAI
6. Gareth Widdop (c) – sponsored by Dynamic Projects
7. Ben Hunt– sponsored by Paul's Customs and Forwarding Solutions
8. James Graham – sponsored by EFEX                                                  
9. Cameron McInnes – sponsored by Floormania
10. Paul Vaughan – sponsored by My Muscle Chef
11. Tyson Frizell – sponsored by Val Morgan
12. Tariq Sims – sponsored by Stonemasons & Landscapers (since 1970)
13. Jack de Belin – sponsored by Wollongong Jetski

Interchange:
14. Jeremy Latimore – sponsored by Addbuild Additions
15. Kurt Mann – sponsored by Wollongong Diagnostics
16. Leeson Ah Mau – sponsored by Westfund
17. Luciano Leilua – sponsored by Domus Lighting
18. Patrick Herbert
19. Blake Lawrie
20. Jai Field
21. Zac Lomax