Dane Gagai appears set to play in the State of Origin opener, the Queensland centre overcoming tonsillitis to train on Tuesday in Townsville.
The South Sydney centre's health scare - he missed training on Friday and Sunday - was the latest in a string of injury concerns for Maroons coach Paul Green.
But Cameron Munster (foot), Harry Grant (hamstring) and AJ Brimson (knee) all completed their final training session in a sign there would be no further tinkering after the withdrawal of Kalyn Ponga (groin) last week.
Ponga's absence has opened the door for North Queensland winger Kyle Feldt to debut at his home stadium, while Valentine Holmes will shift to fullback. Green, an NRL premiership coach with the Cowboys in 2015, is coaching Queensland for the first time.
The Maroons are seeking back-to-back series wins after an against-the-odds victory under Wayne Bennett last year.