Four NRL players will sit out Round 20 with suspensions while Warriors prop Charlie Gubb will challenge the grading of his grade 2 shoulder charge at the judiciary on Wednesday.

Titans forward Greg Bird will miss one match over a grade two careless high tackle, while Knights trio Jake Mamo (dangerous contact), Daniel Saifiti (shoulder charge) and Sione Mata'utia (careless high tackle) will also miss one match.

Panthers forward Leilani Latu is free to play this week after entering an early guilty plea for tripping.

Gubb is facing a potential seven-match ban after pleading guilty to a shoulder charge, having committed two similar offences in the last two years, but is looking to downgrade the charge at the judiciary on Wednesday night.