St George Illawarra coach Paul McGregor has trimmed his squad ahead of the Dragons' Round 19 clash against the Cowboys at 1300Smiles Stadium, Townsville.

Tyson Frizell has been ruled out, joining Nene Macdonald (foot) on the sidelines to face North Queensland.

NRL squad for Round 19 v North Queensland:

1. Matt Dufty – sponsored by Illawarra Mercury/St George & Sutherland Shire Leader

15. Kurt Mann – 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

12 Tariq Sims - sponsored by Stonemasons & Landscapers (since 1970)

17. Luciano Leilua – sponsored by Val Morgan

13. Jack de Belin – sponsored by Wollongong Jetski

Interchange:

14. Jeremy Latimore – sponsored by Addbuild Additions

16. Leeson Ah Mau – sponsored by Westfund

19. Blake Lawrie - sponsored by Domus Lighting

20. Jai Field – sponsored by Wollongong Diagnostics

18. Patrick Herbert

21. Jordan Pereira